Question

4(x - 2y) - (5x + 3y)=30
3(3x + 7y) - 2(x + 9y)=12

Maka x dan y adalah?

Answer 1

4x - 8y - 5x - 3y = 30
- x - 11y = 30
x = -11y - 30

9x + 21y -2x - 18y = 12
7x + 3y = 12
-77y -210 + 3y = 12
-74y = 222
y = - 3

x = 33 - 30
x = 3


maaf bila salah... semoga membantu

Answer 2

4x-8y-5x-3y=30
9x+21y-2x-18y=12

-x-11y=30 (*7)
7x+3y=12
---------------------
-7x-77y=210
7x+3y=12
--------------------- (+)
-74y= 222
Y = 222/-74
Y=-3

Subtitusi y= -3 ke persamaan 7x+3y=12

7x+3(-3)=12
7x+(-9)=12
7x=12+9
7x=21
X=21/7
X=3