Posted by **Jen** on Tuesday, June 9, 2009 at 6:27pm.

Use substitution to determine whether the ordered pair (–2, –3) is a solution of the equation x2 – y = 7. Show some work. Be sure to state your conclusion about whether the ordered pair is a solution or not.

- Algebra -
**Reiny**, Tuesday, June 9, 2009 at 7:10pm
I assume you meant x^2 - y = 7

let's sub in the given point

Left Side = (-2)^2 - (-3)

= 4 + 3

= 7

Right Side = 7

Mmmhh, what do you think?

- Algebra -
**Jen**, Tuesday, June 9, 2009 at 7:26pm
I think that makes sense, although I used 2 computer based calculators that told me the solution was -1. So the annswer is 7 and solution is a true statement.

- Algebra -
**Damon**, Tuesday, June 9, 2009 at 7:33pm
- (-3) = + 3

I think you probably told the calculator 4 - 3 = 1 but it is 4 -(-3) = 4+3 = 7

- Algebra -
**Jen**, Tuesday, June 9, 2009 at 7:50pm
Got it! Thanks!

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