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Solve the system

 

x + 2y = 7

-4x - 5y = 11

 Jul 1, 2020
 #1
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You should really learn how to solve systems.

 

solve for x with the first equation by subracting 2y from both sides yields:

 

x = 7 - 2y

 

substitute into second equation

 

-4x - 5y = 11

-4(7 - 2y) - 5y = 11

distribute the -4

-28 + 8y - 5y = 11

-28 + 3y = 11

3y = 39

y = 13

 

now solve for x:

 

y = 13

x + 2y = 7

 

x + 2(13) = 7

x = -19

 

you could also use a graphing calculator, or use google and search "system of equations solver with steps"

 Jul 1, 2020
edited by Guest  Jul 1, 2020

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