Mathematics, 25.09.2019 00:50 jameslinimk
(01.01) kisha and rae are asked to solve β5x β 14 = 2x + 7. identify where one of them made an error.
kisha
β5x β 14 = 2x + 7
β5x β 14 β 2x = 2x + 7 β 2x
β7x β 14 = 7
β7x β 14 + 14 = 7 + 14
β7x = 21
negative 7x over negative 7 equals 21 over negative 7
x = β 3
rae
β5x β 14 = 2x + 7
β5x β 14 + 5x = 2x + 7 + 5x
β14 = 7x + 7
β14 + 7 = 7x + 7 + 7
β7 = 7x
negative 7 over 7 equals 7x over 7
x = β 1
rae made the error when she added 7
rae made the error when she added 5x
kisha made the error when she subtracted 2x
kisha made the error when she divided by β7
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