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roti = y
3x + 2y = 13,5... 1)
5x + 2y = 18,5... 2)
dit 4x + 3y = ....
eliminasi pers 1) dan 2)
diperoleh
2x = 5
x = 2,5
subsitusikan nilai x ke pers 1
3.2,5 + 2y = 13,5
7,5 + 2y = 13,5
2y = 13,5 - 7,5
2y =6
y = 3
4x + 3y = 4.2,5 + 3.3
= 10 + 9 = 19
jdi yg harus dibayar cecep adalah 19rb