Question

Himpunan penyelesaian dari x=5-y & 2x+3y=7 tolong dengan cara subtitusi

Answer 1

2(5-y)+3y=7
10-2y+3y=7
y=-3
subs y=-3 ke x=5-y
x=5+3
x=8

Answer 2

1. x = 5-y
2. => 2x+3y=7
    => 2(5-y)+3y=7
    => 10-2y+3y=7
    => y+10=7
    => y = -3

x = 5-y
   = 5--3
   = 5+3
x = 8