Who would ask for 5x-y = 120, 3y-11x = 120?

It's very simple
Let 5x-y = 120 (1)
3y-11x=120 （2）
（1）×3=360
15x-3y=360（3）
（3）+（2）=15x-3y+3y-11x=480
4x=480
x=120
Substituting x = 120 into (1)
We get 600-y = 120
y=480
∴x=120
y=480

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