math question (equivalent)

Mathematics
Tutor: None Selected Time limit: 1 Day

May 12th, 2015

-2x = 8

multiply by (-1) we get 2x= - 8 so b is right

if we divide by -2 we get x= -4 so a is incompatible

check also c: 3*(-4)+5 = -12+5=-7 on the left and on the right 6*(-4)-17 = -24-17 =-41 incompatible

check also d: 3*(-4)+5 = -12 + 5=-7. on the right: 12*(-4)+17 = -48+17 = -31 incompatible

only b is right then.



May 12th, 2015

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