Question

Ahhhh i need help again.

Answer 1

Answer:

B

Step-by-step explanation:

A. these simply to 21 + 7x and 21 + 3x

• this one is incorrect because the 7x and 3x are different

B. these simplify to 10 + x and 10 + x

• this is the correct one since they are exactly the same

C. these simplify to 21x and 7x + 21

• these two are not the same because one expression has only a number with a variable but the other one has a number with a variable and another number

D. these simplify to  $\frac{7}{3-x}$  and  $\frac{7}{x-3}$

• in subtraction, the order of the 3 and the x matters, so the equations are not the same
• example: 6 - 4 = 2 but 4 - 6 = -2