azzammohamed784 azzammohamed784

06-12-2020
Mathematics

contestada

2z - 31 = -9z + 24

can anyone tell me how to know if we must subtract or add? like we must write it as this when we solve it 2z - (- 9z) or 2z + -9z

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erinsupersonic03 erinsupersonic03

06-12-2020

you would combine like terms so the answer would be -7z-7

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briannahart04 briannahart04

06-12-2020

you move one of the equations to the other side and then combine like terms

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