Posted by Ronny on Thursday, May 21, 2009 at 4:35pm.
The only t table I know about is the statistical t and that doesn't fit a pre-algebra problem. So I assume you mean to substitute -3 for x and you want to know y. Then substitute 4 for y and you want to know x.
If so,
y = 3x+7
y = 3(-3)+7
y = -9+7
y = -2
etc. Check my work.
(5x+9y)(5x-9y)
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