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→5x+y=40----->Reemplaando el valor de "y"⇒5x+15=40⇒5x=25⇒X=5
5x=40-y
⇒x=40-y/5...(α)
→9x+2y=75
9x=75-2y
⇒x=75-2y/9...(β)
Igualando α y β:
40-y/5=75-2y/9
(40-y)(9)=(75-2y)(5)
360-9y=375-10y
10y-9y=375-360
∴y=15
∴x=5