Solve for 5x + 4y = - 39 and 2x - 4y = 18

2x - 4y = 18

2x - 4y+4y = 18+4y

2x= 18+4y

2x/2= 18+4y/2

x=9+2y

5x + 4y = - 39

5(9+2y) + 4y = - 39

5(9) (5)(+2y) + 4y = - 39

45+10y+ 4y = - 39

45+14y= - 39

45+14y-45= - 39-45

14y=-84

14y/14=-84 /14

y=-6

x=9+2y

x=9+2(-6)

x=9-12=-3