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y = motor
x + y = 35 x4
4x + 2y = 90 x1
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4x +4y = 140
4x + 2y = 90 -
----------------------
2y = 50
y = 25
banyak motor = 25 buah
Misalkan motor = y
x + y = 35
x = 35 - y
4x + 2y = 90
4(35 - y) + 2y = 90
140 - 4y + 2y = 90
-4y + 2y = 90 - 140
-2y = -50
y = 25
Jadi banyaknya motor adalah 25 buah.