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how do u use substution.

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Guest Apr 27, 2017
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Let's say you have two equations, y=3x+6 and 2x+3y=7.

First, you want to plug y=3x+6 into 2x+3y=7.

2x+3(3x+6)=7

Then distribute:

2x+9x+18=7

Simplify:

11x+18=7

Subtract 18 from both sides:

7-18=-11

11x=-11

Divide both sides by 11:

x=-1

Plug x back into one of the original equations:

y=3(-1)+6

Simplify:

y=-3+6

y=3

x=-1, y=3

And that is how you do substituton.

AdamTaurus  Apr 27, 2017

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