Question

Substitusi dari x+y-10=0 dengan x-y+2=6

Answer 1

X+y-10 = 0
x-y+2 = 6 <=> y = x-4

x+(x-4)-10 = 0
2x-14 = 0
x = 7

x+y-10=0
7+y-10=0
y = 3

eliminasi :
x+y-10 = 0
x-y+2 = 6
------------------ +
2x - 8 = 6
2x = 14
x = 7

jika x=7
maka,
x-y+2=6
7-y+2 = 6
-y = -3
y = 3