Solve the system by substitution x+5y=4 2x+10y=8

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asked Jan 23, 2016 21.9k views

5 votes

Solve the system by substitution
x+5y=4
2x+10y=8

Mathematics
middle-school

Danbruegge asked

by Danbruegge

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2 Answers

4 votes

Multiply the first equation by 2, that gives you the second.
Any x,y works.

Arussinov answered Jan 25, 2016

by Arussinov

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3 votes

x+5y=4
2x+10y=8

x=-5y+4

2(-5y+4) +10y=8 substituted in the equation for x
-10y+8+10y=8 distributed
8=8 combined like terms (-10y+10y)
0=0

MANY SOLUTIONS/INFINITE

DDan answered Jan 28, 2016

by DDan

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