# Algebra

A piggy bank contains only nickels and dimes. In all there are 42 coins with a total value of \$3.85. How many nickels are in the piggy bank?

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1. Let x = # of nickels, y = # of dimes

x + y = 42

y = 42 - x

5x + 10y = 385

Substitute 42 - x for y.

5x + 10(42-x) = 385

Solve for x.

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posted by PsyDAG
2. a peggy bank contains only nickels and dimes. in all there are 42 coins with a total value of 3.85. how many nickels are in the peggy

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3. a 17-foot ladder leans against a wall. if the ladder is 8 feet from the base of the wall, how far is it from the bottom of the wall to the top of the ladder

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4. 10-foot ladder leans against an 8-foot wall. How far from the wall should the foot of the ladder be placed so that the top of the ladder will be exactly at the top of the wall?

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posted by Ali

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