Plotting points??? Equations??? Help?

Question

1. Find a equation of the line containing the given pair of points. (-5,0) and (0,9)

What is the equation of the line? y= ?

2. Find an equation of the line containing the given pair of points.Express your answer in the form x=a, y=b, or y=mx+b (0,0) and (8,5)

What is the equation of the line? y=??

3. Graph the equation by plotting points y+2=0

4. Graph the equation by plotting points x=4

Answer 1

1> y = (9 over 5) x + 9

2> y = (5 over 8)x + 0

3 and 4> sorry i cant do the graphing for ya

Answer 2

The generic formula for a line in slope-intercept form is:  y = mx + b

So first, you need to find the slope. which you can when given two poiints.  Slope is the "change in y" / "change in x": so:

m = (0 - 9) / (-5 - 0)

m = -9 / -5

m = 9/5

Now that we have and m, x, and y (well, we have 2 x's and 2 y's, but only need one), we can solve for b.  Just pick one of the points to plug into the formula:

y = mx + b

0 = (9/5)(-5) + b

0 = -9 + b

b = 9

So your formula is:

y = (9/5)x + 9

The same steps can be done on number 2.

Answer 3

others gave 1 and 2

graph of 3 is a straight line parallel to the x axis at y-2

4)  straight line parallel to the y axis at x=4