math equations help?

Question

Solve the system of equations by any method:
1. 3x + 4y = 12
y = -x + 3



2. 1 x = 1 y -1
5 2
y + 3 = 2x



3. Wendy has 52 coins of nickels and dimes. If the value of the coins is
$4.45, then how many of each type does she have?




4. The width of a rectangle is 13 feet less than the length. The perimeter
is 86 feet. Find the length and the width.



5. Y over y+4 + 3over y-2 = 18 over x2+2x-8


Also if any loves to do math problems I have several each week for you and is there a site where I can post algebra problems and gets them answered like this site? Love ya, thanks a billion.

Answer 1

1. Since y = -x + 3 , 4y = -4x + 12.
3x + 4y = 3x + (-4x) + 12
= -x +12
3x + 4y + x = 12
4x + 4y = 12
(a contradiction) to 3x + 4y = 12 , unless x = 0 , then y = 3.

2. Don't know what you mean.

4. w(idth) = length - 13

2(w+L) = 86

w+L = 43

L-13 +L = 43

2L = 43 + 13 = 56

L = 28

28 - 13 = w = 15

width = 15 ; length = 28.

Answer 2

Why are you doing math during summer? Summer school? awww. Use a calculator.

1) Substitution: Get a variable alone, then plug it in.

2) same as 1

3) N(nickels) + D (dimes)=52
5N(nickels) + 10D(dimes)=4.45
then substitute.

4) Width is given. Ask someone else for the rest.

5) Its too hard to explain without fraction bars

There is a palce for help-- your math teacher. Math teachers usually offer tutoring if you have trouble.

Hope I helped woth your grade. Pass your final!

Answer 3

1.x=0&y=3

Answer 4

A squared + B squared + Margaret Thatcher + '72 Dolphins = Stale Tuna Salad. Glad to help!

Answer 5

upload a million.2 + 6.8 = 8 now you have 8+w=12 subtract 8 on the two factors to get w= 4 and thats your answer right it is the completed equation a million.2+6.8+w = 12 8+w=12 w=4 you will desire to upload in that u subtracted 8 from the two factors

Answer 6

i have answered a few:

1. y=3,x=0.

2. y=5,x=4.

4. length=28 feet, width=15 feet.

5. what exactly is "over".

Answer 7

I would suggest using the substitution method on these questions. Choose one of the variables and put its formula into the other formula and simplify. It should very easy to solve.

Answer 8

#4

P=2L + 2W
Wr=L-13

86= 2L + 2(L-13)
L=length, W=width, P= perimeter
take it from here

Answer 9

I'm very good at mathmatics, I can help you on all your math if you want, I don't mind. This is my email: [e-mail]

Answer 10

So you wanna come over and mow my lawn, wax my car and paint the house for me...... and I'll do your homework??