Maggie has $30. She buys 4 CDs that cost $6.50 each. Which equation can she use to find out how much money, m, she has left? $30 - $6.50 = m Sale $4.50 Each $30 - (4 x $6.50) = m %3D $30 $6.50 = m $6.50 x 4 = m Done

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.