Homework Help: Algebra

Posted by Amber on Monday, January 14, 2008 at 6:49pm.

ok this is really confusing me

1. Leo held a garade sale. He priced all the items at a dim or a quarter. His sales totaled $23.95 for 139 coins. How many dimes and quarters did he have?

Algebra - Amber, Monday, January 14, 2008 at 6:54pm
your supposed to solve my graphine. subsitution or elimination
Algebra - Damon, Monday, January 14, 2008 at 7:00pm
d dimes and q quarters
d+q = 139
10 d + 25 q = 2395

I would solve the first equation for d = (139 - q)
then substitute that value for d in the second equation

however you could just as well multiply the first equation, both sides, all terms, by ten. the if you subtract the first equation from the second, you eliminate d.

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