Mathematics - 24 September 2007

Please tell me the answers to these questions. I just don't understand them :(

What does it mean to "solve" a system of linear equation?

How can you use graphs to estimate the solution for a system of linear equations?

Explain how to use the susbstitution method to solve a system of linear equations.

In what cases would graphing probably be more convinient that substitution? When would substitution be more convinient than graphing?

Once you're solved a system of equations, how can you check your solution?

2007-09-24 08:23:27 · 2 answers · asked by Anonymous

2007-09-24 08:21:51 · 5 answers · asked by steven L 1

Here's another question too

Find all possible solutions to the equation x^2 + [3]x + [2] = [0] in Z49

2007-09-24 08:06:31 · 3 answers · asked by Rachel V 1

Please help me....i get my homework through the PC and it never told me how to write linear equations.....and now all of a sudden it wants me to answer these questions:

What is the slope of a line parallel to the line whose equation is y - x = 5?

a)-1
b)1/5
c)1
d)5

What is the equation of a line that passes through points (-1, 2) and (5, 2)?


and i dont understand how to even do those

2007-09-24 08:03:48 · 6 answers · asked by The Eternal Warrior? 4

|-4x+12|

2007-09-24 07:29:06 · 3 answers · asked by higherlovetx 5

what is the total weight added together

2007-09-24 07:26:13 · 16 answers · asked by Anonymous

the 2 is x to the 2nd power

2007-09-24 07:02:20 · 2 answers · asked by hawaii 1

to get the solution from the graph

2007-09-24 07:01:22 · 3 answers · asked by Dalila 1

What is the payment each year I will have to make if I want to have $70,000 at the end of 8 years. Interest is compounded annually at 8%

2007-09-24 07:01:04 · 2 answers · asked by Saw 3

You are given that x=4
Find values of:

(2x^-4)^3 * (x^4)^2

2007-09-24 06:40:18 · 6 answers · asked by Anonymous

Determine the equation of each line. Write the answers in standard form using only the integers as the coefficients.

1) The line through (-2,0) with slope of -3/4

2) The line through (-2,4) that is perpendicular to the x-axis.

Please show work and explanation. I really appreciate it!!! Thank you!

2007-09-24 06:34:49 · 5 answers · asked by Vonnie 2

if anyone knows the mothod of finding the answer to this question i would really apreciate it

4
---

3-/7

its rationalising the denominator

i was doing well up to now

much apriciated

best comment for som1 that tells me the method too!!!

cheers!

2007-09-24 06:34:12 · 2 answers · asked by Dom est.1990 2

THere are 2 cities 4050 apart. A plane leaves one of them, traveling towards the other at 400 miles per hour. At the same time a plane leaves the other city, traveling at an average speed of 410 miles per hour. How long will it take them to meet?

2007-09-24 06:33:54 · 4 answers · asked by higherlovetx 5

argument with a friend and he believes you can copyright anything which is written

2007-09-24 05:57:29 · 6 answers · asked by Anonymous

2007-09-24 05:46:28 · 6 answers · asked by Deutschjoe 3

Step by step please

2007-09-24 05:22:45 · 3 answers · asked by Tp 2

2007-09-24 05:14:04 · 8 answers · asked by Anonymous

a farmer has 120m of fencing. by using an existing wall, h decides to make a rectangular pen by adding 3 sides, with 2 sides equal to x m as shown in the diagram. show that the area enclosed, A m^2, is given by A=x(120-2x).

complete the square on the expression for A and hence find the greatest value of A and the value of x for which this occurs

2007-09-24 04:50:02 · 2 answers · asked by Anonymous

hi please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-09-24 04:46:00 · 12 answers · asked by djbum1000 1

2007-09-24 04:43:32 · 7 answers · asked by SALLY T 1

2007-09-24 04:42:39 · 12 answers · asked by Anonymous

2007-09-24 04:30:31 · 1 answers · asked by vrpraman 1

The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula Rt=1/1/R1+1/R2. simplify the formula.
Where I have typed R1 and R2 the number is supposed to be little and below the r to the right? Does this make sense? Kind of like how we would write the exponents but down instead of up.

2007-09-24 04:15:54 · 4 answers · asked by Anonymous

A.21/30 B.12/15 C.13/10 D.18/20

2007-09-24 04:06:05 · 12 answers · asked by panktee p 1

Consider the following Linear Programming problem developed at Jeff Spencer’s San Antonio optical scanning firm:
Maximize profit = $1x 1 + $1 x 2
Subject to: 2 x 1 + 1 x2 ≤ 100
1 x1+ 2 x2≤ 100
a) What is the optimal solution to this problem? Solve it graphically.
b) If a technical breakthrough occurred that raised the profit per unit of , would this affect the optimal solution?
c) Instead of an increase in the profit coefficient that profit was overestimated and should only have been $1.25. Does this change the optimal solution?

2007-09-24 03:45:33 · 1 answers · asked by Depina 2

1) y=-7x^2-6x-1

2)y=4x^2+8x-1

how do you do something like this

2007-09-24 03:10:32 · 2 answers · asked by camaroking08 1

2007-09-24 03:10:25 · 1 answers · asked by hottie 1

2007-09-24 03:07:49 · 1 answers · asked by hottie 1

3+square root x^2-8x=0

2007-09-24 02:55:57 · 3 answers · asked by sunshine2211 2

9) Which of the following is a correct definition of a kilocalorie?
A) the amount of heat required to raise the temperature of 1 g of water by 1°F
B) the amount of heat required to raise the temperature of 1 g of water by 1°C
C) the amount of heat required to raise the temperature of 1 kg of water by 1°F
D) the amount of heat required to raise the temperature of 1 kg of water by 1°C
E) the amount of heat required to raise the temperature of 1,000 g of water by 1°F

i have no idea i am terrible at these things help pls

2007-09-24 02:34:00 · 6 answers · asked by NH 2