2x + 3y = 10 dan x + 4y =10 nilai dari 4x - 3y =

eliminasi nilai x
2x + 3y = 10. |x1]
x + 4y =10. |x2|

2x + 3y = 10
2x + 8y =20
__________-
-5y=-10
y= 2

subtitusi nilai y

x + 4y =10
x + 4(2)=10
x + 8 =10
x= 2

jadi nilai dari
4x - 3y =
=4(2)- 3(2)
=8-6
=2

Jawab =
2x + 3y = 10
x + 4y = 10 atau x = - 4y + 10
pakai subtitusi
2x + 3y = 10
2(-4y+10)+3y = 10
-8y + 20 + 3y = 10
-8y + 3y = 10-20
 -5y = -10
y = -10/-5
y = 2
lalu x?
2x + 3y = 10
2x+3(2) = 10 
2x + 6 = 10 
2x = 10 -6
2x = 4
x = 4/2
x = 2
lalu,
 4x - 3y = 4(2) - 3(2)
             = 8-6
             = 2