P has a y intercept of 6 and a slope of 1 up for every two to the right, 1/2
y = (1/2) x + 6
Q has a y intercept of -3 and a slope of 4 down from every one to the right, -4.
y = -4x - 3
For the solution we equate the two ys,
(1/2)x + 6 = -4x - 3
x + 12 = -8x - 6
9x = -18
x = -2
y = (1/2) (-2) + 6 = 5
Solution: (x,y)=(-2, 5)