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Respuesta :

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Answer:

Step-by-step explanation:

sub 3x+20 into x²+2x

3x+20=x²+2x

x²-x-20

=(x-5)(x+4)

x=5,-4

Plus x values into y=3x+20

When x=5

y=33

When x=-4

y=8

when x=5 y=33

and when x=-4 y=8

Hope it helps!!

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