Show me how to solve. y = - 7x + 3

To do this plug in 0 for the x and y when you are trying to find one value like this:

First I would plug in 0 for y:

0 = - 7x + 3

Now do anything to isolate x:

-3 = - 7x

3/7 = x

Now plug in 0 for x to find the y

y = - 7 (0) + 3

y = 3