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What are the solutions to the system of equations?

y=−x2−5x−6

x+y=−3

 

Choices:

(−3, 0) and (−1,−2)

(−3, 0) ​and (−2, 0)

(−3, 0) ​and​ (−2,−1) ​

(−2, 0) and​ (−1,−2) ​

 Dec 18, 2018

Best Answer 

 #1
avatar+4624 
+3

I think you mean: y=x25x6 and x+y=3. Taking x to the other side in our second equation, we have y=3x . This means x25x6=3x, so by using the quadratic formula, we get x=3,x=1.

From here, first by plugging x=3 in the second equation to solve for y, we get      3+y=3,y=3+3,y=0. Consequently, by plugging in x=1, we get    1+y=3,y=3+1,y=2. Finally, our two ordered pairs are (3,0),(1,2) , so (A) or the first option. 

 Dec 18, 2018
 #1
avatar+4624 
+3
Best Answer

I think you mean: y=x25x6 and x+y=3. Taking x to the other side in our second equation, we have y=3x . This means x25x6=3x, so by using the quadratic formula, we get x=3,x=1.

From here, first by plugging x=3 in the second equation to solve for y, we get      3+y=3,y=3+3,y=0. Consequently, by plugging in x=1, we get    1+y=3,y=3+1,y=2. Finally, our two ordered pairs are (3,0),(1,2) , so (A) or the first option. 

tertre Dec 18, 2018

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