Homework Help: Math

Posted by Crystal on Friday, June 12, 2009 at 5:39pm.

Use substitution to determine whether the ordered pair (–2, –3) is a solution of the equation x^2 – y = 7

I say no, but am still not sure because the signs are confusing. Am I correct? Thanks!

Math - Reiny, Friday, June 12, 2009 at 5:50pm
let's see if the point satisfies the equation
Left Side
= x^2 - y
= (-2)^2 - (-3)
= 4 + 3
= 7

Right Side = 7

Mmmmhhh?
Math - Crystal, Friday, June 12, 2009 at 5:51pm
I guess this makes sense but I got -1 for the answer. Did I confuse the signs?
Math - Ms. Sue, Friday, June 12, 2009 at 6:00pm
Yes. You confused the signs. Perhaps you thought that -2^2 was -4. But when you multiply two negative numbers, the answer must be positive.

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