Question

Himpunan penyelesaian dari SPLDV: x = 7 - 2y dan x + 5y = 4 adalah

Answer 1

X+5y=4
x+2y=7  _
3y=-3
y=-1

x+2y=7
x-2=7
x=9
 penyelesaian x=9 , y=-1

Answer 2

*) x=7-2y
x+2y = 7
**) x+5y = 4
--------------------------
x+2y = 7
x+5y = 4
-------------- -
-3y = 3
y = -1

x+2y = 7
x = 7 - 2y
x = 7 - 2(-1)
x = 9

HP : (9,-1)