Three times a number, x, plus four times a number, y, equals 81. Two times

Algebra
Tutor: None Selected Time limit: 1 Day

 x minus four times y equals -46. Find the numbers by setting up a system of linear equations and solving the system using the elimination method.

x = 7, y = 15  x = 11, y = 9  x = 12, y= 11  x = -11, y = 13

Jun 24th, 2015

Thank you for the opportunity to help you with your question!

2x-4y = -46 

3x+4y = 81

add the two equations, y will be eliminated 

5x = 35 

x = 7 

plug it into 2x-4y = -46 

y = (46+2x)/4 = (46+14)/4  = 15 

 



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Jun 24th, 2015

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