Question 37062This question is from textbook
: Solve by substitution -
8x - 4y = 16
y = 2x - 4
This question is from textbook
Answer by jcmtnez(53)   (Show Source):
You can put this solution on YOUR website! 8x - 4y = 16
y = 2x - 4
In this system you have the y isolated in the second equation so you only have to substitute it in the first.
8x-4(2x-4)=16
8x-8x+16=16
8x-8x=16-16
0=0
This is not a system of equation this is an identity, we have obtain an identity because the first and the second equations are the same but with different coefficients.
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