USING TWO OR MORE TRANSFORMATIONS

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Presentation transcript:

USING TWO OR MORE TRANSFORMATIONS Solving a Linear Equation SOLUTION Solve x + 6 = – 8 1 3 To isolate the variable, undo the addition and then the multiplication. = – 8 x + 6 1 3 Write original equation. x + 6 – 6 = – 8 – 6 1 3 Subtract 6 from each side. x = –14 1 3 Simplify. x) = 3(–14) 1 3 3( Multiply each side by 3. x = – 42 Simplify.

Combining Like Terms First Solve 7x – 3x – 8 = 24. 7x – 3x – 8 = 24 Write original equation. 4x – 8 = 24 Combine like terms. 4x – 8 + 8 = 24 + 8 Add 8 to each side. 4x = 32 Simplify. 4x 4 = 32 Divide each side by 4. x = 8 Simplify. The solution is 8. When you check the solution, substitute 8 for each x in the original equation.

Using the Distributive Property Solve 5x + 3(x + 4) = 28. METHOD 1 Show All Steps 5x + 3(x + 4) = 28 5x + 3x + 12 = 28 8x + 12 = 28 8x + 12 – 12 = 28 – 12 8x = 16 x = 2 8x 16 8 = METHOD 1 Show All Steps METHOD 2 Do Some Steps Mentally 5x + 3(x + 4) = 28 5x + 3(x + 4) = 28 5x + 3x + 12 = 28 5x + 3x + 12 = 28 8x + 12 = 28 8x + 12 = 28 8x + 12 – 12 = 28 – 12 8x = 16 x = 2 8x = 16 8x 16 8 = x = 2

Multiplying by a Reciprocal First Solving equations systematically is an example of deductive reasoning. Notice how each solution step is based on number properties or properties of equality. It is easier to solve this equation if you don’t distribute first. 6 5 – Solve 66 = (x + 3) 6 5 – Solve 66 = (x + 3) 6 5 – 66 = (x + 3) 6 5 – Write original equation. 66 = (x + 3) 5 6 – Multiply by reciprocal of . 6 5 – –55 = x + 3 Simplify. – 5 8 = x Subtract 3 from each side.

SOLVING REAL-LIFE PROBLEMS Using a Known Formula SOLUTION Use the formula to convert 95 °F to Celsius. SOLUTION Use the formula to convert 95 °F to Celsius. A body temperature of 95 °F or lower may indicate the medical condition called hypothermia. What temperature on the Celsius scale may indicate hypothermia? 9 5 F = C + 32 Write known formula. The Fahrenheit and Celsius scales are related by the equation F = C + 32 9 5 95 = C + 32 9 5 Substitute 95° for F. 63 = C 9 5 Subtract 32 from each side. Multiply by , the reciprocal of . 5 9 35 = C A temperature of 35°C or lower may indicate hypothermia.