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Find the intersection of the lines 9x-4y=30 and 7x+y=\(17\) Express your answer as an ordered pair (x,y).

 Apr 24, 2022
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Write the second equation   as   y  =  17 - 7x

 

Sub this  into the first equation 

 

9x  - 4 ( 17 - 7x)  =  30

 

9x - 68 + 28x  = 30

 

37x  =  30 + 68

 

37 x =  98

 

x =  98  / 37

 

And y  =   17 - 7 (98/37)  =  -57 / 37

 

(x , y)  =  ( 98 / 37  ,   -57 / 37  )

 

cool cool cool

 Apr 24, 2022

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