Y=-3x+12 Y=3x-6 How do I solve this step by step system of substitution

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asked May 3, 2015 46.4k views

1 vote

Y=-3x+12
Y=3x-6
How do I solve this step by step system of substitution

Mathematics
high-school

Nicolast asked

by Nicolast

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1 Answer

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$\left \{ {{y=-3x+12} \atop {y=3x-6}} \right. \\\\ Equal\ both\ equations\\\\\ -3x+12=3x-6\ \ \ | subtract\ 3x\\\\ -6x+12=-6\ \ \ | subtract\ 12\\\\ -6x=-18\ \ \ | divide\ by\ -6\\\\ x=3\\ y=3*3-6=9-6=3$

Ken Struys answered May 7, 2015

by Ken Struys

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