14-05-2017
Mathematics

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Equations by substitution
y=3x-7; 2x+4y=14

Equations by substitution y3x7 2x4y14 class=

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14-05-2017

Let's plug in y=3x-7 into 2x+4y=14
2x+4 (3x-7)=14
Distribute
2x+12x-28=14
Add
14x-28=14
Add 28 to both sides
14x=42
Divide
X=3
Y=3 (3)-7
Y=9-7
Y=2
(3,2) A the solution is (3,2)

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