Draw the lines: (a) y= 3x-2 (b) y= -2x?

Question

This is a maths question I'm stuck on. Anybody who's a math genius? - then please help! Can I have answers and a good ( not too long ) description of how to solve questions like these?

Answer 1

for equation (a), give 'x' values, start at 'x=0', 3(0)-2=-2, so when your x coordinate is at 0, your y coordinate is at -2, put a mark at that point. now do a number greater than 0. i'll do 'x=2', 3(2)-2=4, now put a mark at (2,4). then do a number less than 0, i'll do '-2'. 3(-2)-2=-8 (careful with positives and negatives), now put your mark at (-2,-8). now draw a line through all three marks. do the same thing with the other equation.

Answer 2

All you gotta do is know what X or Y eqals.....for (a) if X=2 then Y=4 if X=1 then Y=1 if X=0 than Y= -2 and so on....you just continue the line
for (b) if X=2 then Y= -4 if X= 1 then Y= -2 if X=0 than Y= 0 and juss attach the lines
its very simple once you get the hang of it = ]

Answer 3

This is a simple question of algebraic slopes. If you are at a point in your education to ask this question, then you are far enough along to have a competent math teacher. Read your textbook, ask a fellow student, or, as a last resort, ask the teacher. Believe me you do not need to be a genius to solve this type of question. I could do it for you, but when done, you would know no more than you do now. P.s. You will probably get a dozen answers from other posters wanting to show off. Most of them will be right, some wrong. Beware.

Answer 4

For both questions:

For each value of x from say x = -5 to x = 5 list the corresponding values for y
Then with x as the horizontal axis and y as the vertical axis plot the results (calculated above) onto graph paper (or similarly lined paper)

For example in (a) if x =2 then y = (3x2)-2 = 4
and, in (b) if x = 2 then y = (-2) x 2 = -4

Answer 5

When you have an equation like y=mx + b, the m is the slope of the line, and b is the y-intercept, (0,b)

Start at the y-intercept and put a point at (0, -2). Then take one step to the right and three up and you get (1,1). Do it again and get (4,2). Connect the points, extend to infinity.

The second line will have a point at (0,0) and go down 2 steps for each step you take to the right.