I am unsure how to do this

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secondary 2 | Maths
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secondary 2 Maths Singapore

I am unsure how to do this

Date Posted: 3 years ago

x+y=52
3x+2y=139 -(1)
x=52-y -(2)
substitute eqn (2) into eqn (1)
3(52-y)+2y=139
156-3y+2y=139
y=17
When y=17, x=52-17
x=35

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Date Posted: 3 years ago