Question

Which value is equivalent to x-7/7-x?
O -7
O -1
O 1
O 7

Answer 1

Answer:  -1

This is because 7-x = -(x-7) and the x-7 terms cancel, leaving -1 behind.

$\frac{x-7}{7-x} = \frac{x-7}{-1(x-7)} = -1 \text{ where } x \ne 7$