Question

Tentukan HPnya dengan substitusi
2y - x = 7 dan x + 2y = 21

Answer 1

2y-x = 7
2y+ x=21
_______ -
    -2x = -14
       x= -14 ; -2
       x= 7

2y + x = 21
2y + 7 = 21
       2y = 21- 7
       2y = 14
       y = 7

hp= { 7, 7}

Answer 2

X + 2y  = 21 
-x + 2y =   7 - 
       2x = 14 
         x = 7

-x + 2y = 7
-(7) + 2y = 7
-7 + 2y = 7
2y = 7 + 7
2y = 14
y = 7

himpunan = {7,7}

maaf kalo salah