Question #4c8a8

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Question #4c8a8

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Answer 1 · 2017-03-18T21:41:32

$x=2" and "y=8$

Explanation:

We have the following equations.

$xcolor(red)(+y)=10to(1)$

$color(red)(y)=4xto(2)$

Solve using the $color(blue)"substitution method"$

That is substitute $color(red)(y)=4x" into " (1)$

$rArrx+4x=10$

$rArr5x=10$

divide both sides of the equation by 5

$(cancel(5) x)/cancel(5)=10/5$

$rArrx=2$

Substitute this value into ( 2 ) to obtain value for y

$rArry=4xx2=8$

$color(blue)"As a check"$

Substitute these values into the original statements and if they are true then these are the solutions.

$x+y=2+8=10to" True"$

$y=4xx2=8to" True"$

$rArrx=2" and "y=8" are the solution"$

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Question #4c8a8

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