Question

Derek tried to solve an equation step by step.

\begin{aligned} 8d&=72\\\\ \dfrac{8d}{8}&=\dfrac{72}8&\green{\text{Step } 1}\\\\ d&=8&\blue{\text{Step } 2} \end{aligned}
8d
8
8d
​

d
​

=72
=
8
72
​

=8
​

Step 1
Step 2
​

Find Derek's mistake.
Choose 1 answer:
Choose 1 answer:

(Choice A)
A
\green{\text{Step }1}Step 1start color #28ae7b, start text, S, t, e, p, space, end text, 1, end color #28ae7b

(Choice B)
B
\blue{\text{Step }2}Step 2start color #6495ed, start text, S, t, e, p, space, end text, 2, end color #6495ed

(Choice C)
C
Derek did not make a mistake.

Answer 1

Explanation:

`\begin{aligned} 8d&=72\\\\ (8d)/(8)&=\frac{72}8&\green{\text{Step } 1}\\\\ d&=8&\blue{\text{Step } 2} \end{aligned}`

Derek's Mistake ;

`(8d)/(8) =(72)/(8) \\\\`

Reason ;

`72/ 8 =9 \\\\So ; d = 9`

Answer 2

Step 2 - d=8

Explanation:

72/8 equals 9 not 8