Let's solve this system of linear equations using the addition/subtraction method. Divide all 3 terms of the 1st equation by 5. Combine the resulting equation with the 2nd given equation (2x+y=-8). This will eliminate "x."
Now find y.
Next, subst. your value of y into either of the original equations; find x.
Write your values for x and y as (x, y). That's your "solution."
