How do you solve $x=4y$ and $x=y-3$ using substitution?

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Answer 1 · 2016-03-16T13:16:20

$x,y=-4,-1$

$color(blue)(x=4y,x=y-3$

Substitute the value of $x$ to the second equation

$rarr4y=y-3$

$rarr4y=y=-3$

$rarr3y=-3$

$rArrcolor(green)(y=-3/3=-1$

Substitute the value of $y$ to the first equation

$rarrx=4(-1)$

$rArrcolor(green)(x=-4$

$:.color(green)(|bar (ul(x,y=-4,-1)))|$

How do you solve x=4yx=4y and x=y-3 x=y-3 using substitution?