Homework Help: Math

Posted by Angie on Sunday, May 17, 2009 at 9:38pm.

Which ordered pair is a solution of the system of equations y=x^2-x-20 and y=3x-15?
a. (-5,-30)
b. (-1,-18)
c. (0,5)
d. (5,-1)

When I solved the system of equations I got 5 and -1. What do I do next?

Math - Damon, Sunday, May 17, 2009 at 9:49pm
If x = 5
y = 0, not one of the solutions listed
If x = -1. y = -3-15 = -18
so
(-1,-18) is what they are looking for.

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