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December 18, 2014

Homework Help: Math Help

Posted by TO: Mathmate on Monday, April 23, 2012 at 10:52pm.

This is a substitution equation. Would that change the steps that you did?

Y=3x+1
Y=5x-3
Answer says x=-2 and y=7

Please explain steps. Thanks



math help - MathMate, Monday, April 23, 2012 at 10:25pm
Y=3x+1 ...(1)
Y=5x-3 ...(2)

By comparison of (1) and (2), we conclude that
3x+1=Y=5x-3
3x+1=5x-3
solve for x to get
2x=4
x=2
Put x=2 in (1) to get
Y=3(2)+1=7
Check:
put x=2 in (2) to get
Y=5*2-3=7

If your program gives x=-2 and y=7, there must be a typo somewhere. Check your post

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