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 Depdendent Variable

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 Dependent Variable

 Number of inequalities to solve: 23456789
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# Solving Proportions Using Cross Multiplication

Example 1

Solve the proportion for w:

 Solution Cross multiply. Distribute the 6. Subtract 6w from both sides. Divide both sides by 4. 10w10w 4w w = (w + 4)6= 6w + 24 = 24 = 6

We leave the check to you.

Example 2

Solve the proportion for x:

 Solution Cross multiply. Simplify. This is a quadratic equation. We write it in standard form. Factor the right side. -1 Â· 12 -12 0 0 = (x + 3)(x - 5)= x2 - 2x - 15 = x2 - 2x - 3 = (x - 3)(x + 1) Use the Zero Product Property. Solve each equation. We leave the check to you. x - 3 = 0x = 3 or or x + 1 = 0x = -1