Question

What value of x will make these two expression equivalent?

-3/7 and x/21
A X=-3 B x=7 Cx=9 Dx=-9

Answer 1

D because you would cross multiply 7 and x which would give u -63 making x = -9. -9/21 simplifies down to -3/7.

Answer 2

D. x = -9

Explanation:

We want -(3/7) = (x/21)

Cross multiply: 7x = - 63

x = - 9

Check:

Does (-9/21) = -(3/7)?

(-9/21) reduces to -(3/7) YES