3 years ago

Please help with this algebra question

Mathematics

1 answer:

s2008m [1.1K]3 years ago

6 0

Hello,
Please, see the attached file.
Thanks.

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-2x-y=-9<br> 5x-2y=18<br> substitution

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$-2x-y=-9 \\
5x-2y=18 \\ \\
\hbox{solve the first equation for y:} \\
-2x-y=-9 \ \ \ |+2x \\
-y=-9+2x \ \ \ |\times (-1) \\
y=9-2x \\ \\
\hbox{substitute 9-2x for y in the second equation:} \\
5x-2(9-2x)=18 \\
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x-2=2 \ \ \ |+2 \\
x=4 \\ \\
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\boxed{(x,y)=(4,1)}$