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Y=-x^2+2x+7 Y=2x+7 Can you please help me with this substitution for graphing
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1 vote
Y=-x^2+2x+7
Y=2x+7
Can you please help me with this substitution for graphing

User Ger Crowley
by
8.1k points

1 Answer

1 vote
so subsitute 2x+7 for y
2x+7=-x^2+2x+7
subtract 2x+7 from both sides
0=-x^2
obviously x=0
then subsitute
0 for x
y=2(0)+7
y=0+7
y=7

the answer is
x=0
y=7
User Alexbilbie
by
8.3k points
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