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X+2y=14 Y=3x-14 Substitution

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asked Mar 8, 2015 94.4k views

1 vote

X+2y=14
Y=3x-14
Substitution

Mathematics
middle-school

Liam Bigelow asked

by Liam Bigelow

8.4k points

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2 Answers

3 votes

X+2y=14, okay so you have to write X+2(3x-14)=14

Insoo answered Mar 11, 2015

by Insoo

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4 votes

$\left \{ {{x+2y=14} \atop {y=3x-14}} \right.\\\\Substitution\\\\ x+2(3x-14)=14\\ x+6x-28=14\\ 7x-28=14\ \ \ | add\ 28\\ 7x=42\ \ \ | divide\ by\ 7\\x=6\\ y=3x-14=3*6-14=18-14=4\\\\Solution:\\ \left \{ {{y=4} \atop {x=6}} \right.$

Yonnaled answered Mar 15, 2015

by Yonnaled

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X+2y=14 Y=3x-14 Substitution

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