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Solve Linear Systems by Elimination
Grade Level
Praxis Core
5165.058 Solve Linear Systems by Elimination
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Which choice correctly rewrites, eliminates, and solves the system? (1) (x + y) + 8y = -14; (2) -3x – 11y = 26.
A
First rewrite equation 1 as x + 9y = -14; multiply equation 1 by 10 and equation 2 by 9, then add to eliminate y; solution (-5, 1)
B
First rewrite equation 1 as x + 9y = -14; multiply equation 1 by 11 and equation 2 by 9, then add to eliminate y; solution (-5, -1)
C
First rewrite equation 1 as x + 9y = -14; multiply equation 1 by 11 and equation 2 by 9, then add to eliminate x; solution (5, -1)
D
First rewrite equation 1 as x + 9y = -14; multiply equation 1 by 11 and equation 2 by 9, then subtract scaled equation 2 from scaled equation 1 to eliminate y; solution (-1, -5)
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