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masha68 [24]
3 years ago
8

Solve using substitution. -5x + y = 16 7x – 6y = 19

Mathematics
1 answer:
exis [7]3 years ago
8 0
-5x+y=16
y=5x+16
7x-6(5x+16)=19
7x-30x-96=19
-23x-96=19
-23x=(19+96)
-23x=115
x=(115/-23)
x=-5
-5(-5)+y=16
25+y=16
y=(16-25)
y= -9

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Angles (7x+17)° and (5x-5)° are consecutive interior angles, that means they add up to 180<span>°. 
So we can make an equation to solve for x, which eventually will help us solve for y. 
     180</span> = (7x+17) + (5x -5)

     re arrange that:
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        180 = 23y + 65
        - 65           - 65

        <u>115</u> = <u>23y</u>
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Good luck!







</span>
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