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10 votes
10 votes
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

User Kirill Polishchuk
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2.9k points

2 Answers

11 votes
11 votes
D because you would cross multiply 7 and x which would give u -63 making x = -9. -9/21 simplifies down to -3/7.
User Uncle Dino
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3.3k points
12 votes
12 votes

Answer:

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

User Ken Egozi
by
3.0k points