What is 4x+y=7 when y=x-3?

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What is 4x+y=7 when y=x-3?

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Answer 1 · 2017-12-05T21:48:11

$x = 2, y = - 1$ $x=2, y=-1$

Explanation:

You can substitute your equation beginning with y into the first equation, to get $4 x + (x - 3) = 7$ $4x+(x-3)=7$ .
Simplify:
$4 x + x - 3 = 7$ $4x+x-3=7$
$5 x = 10$ $5x=10$
And solve so
$x = 2$ $x=2$ .
Substitute into $y = x - 3$ $y=x-3$
$y = (2) - 3 = - 1$ $y=(2)-3=-1$

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What is 4x+y=7 when y=x-3?

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