In a rectangular coordinate system, the line 5y = 2x intersects the line 3x - 9y = 7 at point Z. What is the sum of the coordinates of point Z?
y = 2/5 x sub into second equation
3x - 9(2/5 x) = 7
x = -11 2/3
y = 2/5 x = - 4 2/3
