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What are x and y if $4x - 5y = 40$ and $2x + 10y=20$ ?

1 Answer

Mar 27, 2018

$x=10,y=0$

Explanation:

$:.4x-5y=40------(1)$

$:.2x+10y=20------(2)$

$:.(2)xx2$

$:.4x+20y=40------(3)$

$:.(1)-(3)$

$:.-25y=0$

$:.y=0$

substitute $y=0$ in $(1)$

$:.4x-5(0)=40$

$:.4x=40$

$:.x=10$

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