Tolong jawab pakai cara ya. Terima kasih

cari titik c dengan cara eliminasi
2.500x + 2.000y = 140.000 |÷100| ==> 25x + 20y = 1.400
x + y = 60 |×20| ==> 20x + 20y = 1.200
eliminasi
25x + 20y = 1.400
20x + 20y = 1.200
--------------------------- _
5x = 200
x = 200/5 = 40
x + y = 60
40 + y = 60
y = 20
maka titik C = (40,20)
cari nilai tiap titik
-) A (0,60)
f(0,60) = 1.500(0) + 1.250(60) = 75.000
-) B (56,0)
f(56,0) = 1.500(56) + 1.250(0) = 84.000
-) C (40,20)
f(40,20) = 1.500(40) + 1.250(20)
= 60.000 + 25.000
= 85.000
nilai maksimum 85.000