Question

Jamie tried to solve an equation step by step. \qquad\begin{aligned} \dfrac25n+7&=12\\\\ \\ \dfrac25n&=5&\green{\text{Step } 1}\\\\ \\ n&=2&\blue{\text{Step } 2}\\\\ \end{aligned} 5 2 ​ n+7 5 2 ​ n n ​ =12 =5 =2 ​ Step 1 Step 2 ​ Find Jamie'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 Jamie did not make a mistake.

Answer 1

Since Jamie's answer does not tally with the resulting answer, hence she made a mistake in step 2

Expansion of equation

Equations are expressions separated by an equal sign. Given the expression solved by Jamie expressed as:

2/5n+7=12

Subtract 7 from both sides

2/5n+7- 7 =12 - 7

2/5n = 5

Multiply both sides by 5/2

2/5n * 5/2 = 5 * 5/2
n = 25/2

Since Jamie's answer does not tally with the resulting answer, hence she made a mistake in step 2

learn more on equations here: https://brainly.com/question/2972832

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