in the first to second step: -2(7-y)+4=-4 to -14-2y+4=-4, the part -2(7-y) should equal -14+2y instead of 14-2y because two negative signs add to be positive
so y should be 3
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answer: the correct one is a
step-by-step explanation:
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Another question on Mathematics
Mathematics, 21.06.2019 13:00
Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?