Hi,
I have a grade 9 exam tomorrow and I am totally stuck on some of the review questions!
One question is:
Graph A(-1,-4) to B(2,2)
Find the y-intercept on the line.
How do you do that? I graphed the co-ordinates and made the line and found the slope, but how do you find the y-intercept?
Second Question:
Make up an equation of a line that is:
parallel to y=-3x+4 How would you draw it parallel?
Fourth question:
y=-6 What is the slope and y-intercept for that?
Last Question:
How would you graph 4x-2y=8 and y=-3x+1 on the same grid?
Sorry for all the questions, but if anyone has any advice on how to do these PLEASE PLEASE answer me before tomorrow! Thank you soo much!
-Ca33

I'll answer them a litte out of order.
Remember that the basic equation for a straight line is Y=mx + b. m=slope, b = the intercept.

You sound like you're just getting a little confused when the equations don't look quite the same..
Y=-6 is the same as Y=0x+(-6)
It's a flat line with zero slope.. you can determine the intercept as the constant term.

make up a new equation that is parallel to y=-3x+4... Parallel lines never meet so the slopes are equal... you just need to change the constant to get a parallel line. Graph your new equation to prove it to yourself.

Plotting the two equations...on the same graph.
you know how to do the y=-3x+1 (parallel to another line?) The 2nd equation can be rearranged.. 4x-2y=8 is the same as -2y=-4x+8
is the same as -y=-2x+4 is the same as y=2x-4

your first question is the hardest but not impossible. You've figured the slope using the rise over the run? (Y2-Y1)/(X2-X1).

you can then use either point in the y=m(x)+b
We know when X=2,your equation will make y=2
y=mx+b 2=(your slope)*2+b . rearrange
2-(your slope)*2= b the intercept of the y axis when x=0

practice practice practice..it'll come
good luck.. better yet good skill