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Use Substitution to Check a Solution
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ParaPro
PPM.156 Use Substitution to Check a Solution
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For 3z + 10 = 5z - 2, a student checked the value z = 7. Which response correctly uses substitution and interpretation?
A
Substitute z = 7: 3(7) + 10 = 5(7) - 2, so 31 = 33; therefore z = 7 is a solution.
B
Check the changed equation 3z = 5z - 2: 3(7) = 5(7) - 2, so 21 = 33; decide from that.
C
Substitute z = 7 only on the left side: 3(7) + 10 = 31; stop there because the left side has been simplified.
D
Substitute z = 7 into the original equation: 3(7) + 10 = 5(7) - 2, so 31 = 33.
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