Question 289610
To find the values of x and y 
you pick one and find the other based on the equation

The easiest are when x=0 and when y=0
when x=0 y=-4
when y=0 x=2
you only need two points for a,linear equation because it forms a line .
You don't actually solve this equation. There are two unknowns .
you can solve the problem of graphing though.