How do we do this?

First, find the difference between the two x & y co-ordinates:

y² - y¹ = (1 - -5) = 6

x² - x¹ = (0 - -2) = 2

So we now know that for every 6 times y increases, x increases by 2.

We can simplify to y being 3 times x.

So: Y=3x + c.

Now solve for c:

Plug in any of the given co-ordinates for x & y:

(-5) = 3(-2) + c. OR: (1) = 3(0) + c

:. -5 = -6 + c. OR:... more