Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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If the system  is to be solved by substitution, which
expression can be replaced for x in the second equation? A. | 15 - 2y | C. |  | B. | 21 -
5x | D. |  |
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2.
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Solve the system  by substitution. A. | (2, 7) | C. | (5, 1) | B. | (1, -1) | D. | none of these |
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3.
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Use substitution to solve the system of equations. 
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4.
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Which is the solution of this system of equations?  A. | ( 7, 8) | B. | ( 7, 6) | C. | There is no solution. | D. | There is an infinite number of
solutions. |
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5.
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Use substitution to solve the system of equations. 
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