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Chapter 6 - Systems of Equations and Inequalities - 6-3 Solving Systems Using Elimination - Practice and Problem-Solving Exercises - Page 382: 26
Answer
Work Step by Step
You have the equations:4x-8y=15 and -5x+10y=-30.Multiply the first equation by 5 and the second equation by 4 in order to be able to eliminate a variable: 5(4x-8y=15) 20x-40y=75 ---4(-5x+10y=-30) -20x+40y=-120 Combine the equations in order to eliminate them: 20x-40y=75 -20x+40y=-120 0=-45 The equations will never be true so there are no solutions.
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Chapter 1 - Foundations for Algebra - 1-1 Variables and Expressions - Practice and Problem-Solving Exercises - Page 9: 35
Answer
Work Step by Step
A dime is a tenth of a dollar. Thus, we multiply the number of dimes, d, by one tenth to get the number of dollars that the dimes are worth.
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