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