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x+2y = 10 |x2| 2x+2y = 20
langsung di kurang
jadi -3y = -9
y = -9/-3
y = 3
dan menentukan x nya
2x+y = 11
2x+3 = 11
2x = 11-3
2x = 8
x = 8/2
x = 4
Setelah itu
f(x,y)=4x+3y
= 4.4+3.3
=16+9
=25