Question

What is the equation of the line that goes through `(0,0)` and `( - 1,- 2)`?

Answer 1

See below.

Explanation:

Given some line `y=mx+b`, we can plug in the points to find `m` and `b`.

`0=m(0)+b` so `b=0`

`-2=m(-1)+0` so `m=2`.

Thus, the equation is `y=2x`.