Solve a multi-step problem

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Solve a multi-step problem EXAMPLE 4 Solve a multi-step problem Temperature You are visiting Toronto, Canada, over the weekend. A website gives the forecast shown. Find the low temperatures for Saturday and Sunday in degrees Fahrenheit. Use the formula C = (F – 32) where C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit. 5 9

Solve a multi-step problem EXAMPLE 4 Solve a multi-step problem SOLUTION STEP 1 Rewrite the formula. In the problem, degrees Celsius are given and degrees Fahrenheit need to be calculated. The calculations will be easier if the formula is written so that F is a function of C. (F – 32) 5 9 C = Write original formula. Multiply each side by , the reciprocal of . 9 5 · (F – 32) 9 5 C = F – 32 C 9 5 = Simplify. 9 5 C + 32 = F Add 32 to each side.

EXAMPLE 4 Solve a multi-step problem ANSWER 9 5 = The rewritten formula is F C + 32.

EXAMPLE 4 Solve a multi-step problem STEP 2 Find the low temperatures for Saturday and Sunday in degrees Fahrenheit. Saturday (low of 14°C) Sunday (low of 10°C) C + 32 9 5 F = F C + 32 9 5 = = (14)+ 32 9 5 = (10)+ 32 9 5 = 25.2 + 32 = 18 + 32 = 57.2 = 50 The low for Saturday is 57.2°F. ANSWER The low for Sunday is 50°F. ANSWER

GUIDED PRACTICE for Example 4 Use the information in Example 4 to find the high temperatures for Saturday and Sunday in degrees Fahrenheit. 5. 71.6°F, 60.8°F ANSWER