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What iss 7x + y = -9 -x -2y =5?

please help, thank you if you do)

 Feb 27, 2020
 #1
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7x +  y  =  - 9       implies  that   y  = -9 - 7x

 

Sub this into the second equation for   y   and we get that

 

-x - 2( -9 - 7x)   =  5    simplify

 

-x + 18  + 14x  = 5

 

13x  + 18 =  5     subtraact  18 from both sides

 

13x   =  -13     divide both sides  by 13

 

x  = -1

 

And

 

y =  - 9 - 7(-1)   =  -9 + 7 =    -2

 

cool cool cool

 Feb 27, 2020

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