Question

Himpunan penyelesaian x-y=-2y + 20 dan +y=3x-13 adalah....

Answer 1

X-y =-2y    ---->    x= -y
y= 3x-13   ----->  -3x=-y-13
                       ---------------- -
                         4x =13 ----> x = 3,25
x = -y
3,25 = -y
 y = -3,25

Answer 2

X - y = -2y + 20
y = -x + 20

x + y = 3x - 13
y = 2x - 13
-x + 20 = 2x - 13
-3x = - 33
x = 11

y = -x + 20
   = -11 + 20
   = 9

Hp = {11,9}