Jika 2x + y = 18 dan x+2y =24, tentukan nilai dari √64.x+0,5y=

x=24-2y
subtitusi ke
2x+y=18
2(24-2y)+y=18
48-4y+y=18
-3y=18-48
y=-30/-3
y=10

y=10 subtitusi ke x=24-y
x=24-10
x=14

√64.x+0.5y
8x14+0.5x10
=92+5
=97

2x + y = 18     |×1|     2x + y = 18
x + 2y = 24     |×2|     2x + 4y = 48

eliminasi
2x + y = 18
2x + 4y = 48
----------------- (-)
3y = 30
y = 10

subtitusi
x + 2y = 24
x + 2(10) = 24
x = 24 - 20
x = 4

√64 . x + 0,5y
= 8 . 4 + 0,5 . 10
= 32 + 5
= 37