7x + 7y = 49
x + 2y = 10
x + 1y = 7
____________ -
y = 3
x + 1y = 7
x = 7-y
x = 7-3
x = 4
masukan pada soal :
f (x,y) = 8x + 2y
(0,5) = 8(0) + 2(5) = 10
(7,0) = 8(7) + 2(0) = 56
(4,3) = 8(4) + 2(3) = 32 + 6 = 38
Nilai maksimum nya = 56
Baca Juga: Latihan Soal UTS PTS Matematika Kelas 8, Relasi dan Fungsi, Paling Sering Muncul