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24-09-2016
Mathematics

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What is the solution to the following system of equations?
y = −x2 − 5x − 4
y = −x2 + 9x − 18

a. (-1, -10)
b. (1, -10)
c. (-1, 10)
d. (1, 10)

Respuesta :

24-09-2016

Hello,

y=-x²-5x-4
y=-x²+9x-18
==>-x²-5x-4=-x²+9x-18
==>9x+5x=18-4
==>14x=14
==>x=1 ==>y=-1-5-4=-10 (y=-1+9-18=-10

Answer B

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