Question

Mitode subsitusi
x-y=6

2x+3y=7

Answer 1

X-y=6
x=y+6

2x+3y=7
2(y+6) + 3y = 7
2y + 12 + 3y = 7
5y = -5
y = -1

x=y+6
y=-1+6
y=5

Answer 2

X-y=6 | •2
2x+3y=7

= 2x-2y=12
2x+3y=7
------------- -
-5y=5
y=-1

subsitusikan x-y=6
y=-1

x--1= 6
x = 5