Question

2x+3y=19 dan x-y=-8 adalah {(x,y)} nilai x-7y

Answer 1

Y=7 dan x=15 maka x-7y= 15-49= -34

Answer 2

2x-3y = 19 X 1 --> 2x - 3y = 19
x-y = -8 X 2 --> 2x-2y = -16

2x-3y = 19
2x-2y =-16
____________ -
-y = 35
y = -35

x-y = -8
x-(-35) = -8
x+35=8
x= 8-35
x = -27

x-7y=
(-27) - 7(-35)= -27 + 245 = 218