2 (X+Y)+ 3x (Y-1) = 10 Dan X+21=7, Pakai Rumus Ya

2 (x+y)+ 3x (Y-1) = 10 dan X+21=7

pakai rumus ya

 

Jawaban:

x+21=7

x=-14

2 (x+y)+3x (y-1)=10 ===> substitusikan x=-14

2 (-14+y)+3 (-14) (y-1)=10

-28+2y-42y+42=10

-40y=-4

y=1/10 = 0,1