tolong divantu ya,ini gimana ya

eliminasi
4x+2y=8..(×1)
2x+3y=6..(×2)
4x+2y=8
4x+6y=12
________-
-4y=-4
y=1

4x+2y=8
4x+2=8
4x=6
x=6/4
f(x,y) =4x + 5y
(6/4,1) = 6 + 5 =11
(0,2) = 0 + 10 =10
(2,0) = 8 + 0 = 8
(0,0) =0

nilai maksimum 11