High School

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Which equation models the problem and shows the correct solution?

The difference between [tex]x[/tex] and 89 is 7.

A. Write the equation as [tex]89 - x = 7[/tex] and subtract 7 from both sides. The answer is 82.

B. Write the equation as [tex]x - 89 = 7[/tex] and add 89 to both sides. The answer is 96.

C. Write the equation as [tex]x - 7 = 89[/tex] and add 7 to both sides. The answer is 96.

D. Write the equation as [tex]7 - x = 89[/tex] and subtract 7 from both sides. The answer is 82.

Answer :

We start with the statement:

$$\text{"The difference between } x \text{ and } 89 \text{ is } 7."$$

Interpreting “the difference between $x$ and $89$” as $x - 89$, we can write the equation:

$$x - 89 = 7.$$

To solve for $x$, add $89$ to both sides:

$$
\begin{aligned}
x - 89 + 89 &= 7 + 89\\[6pt]
x &= 96.
\end{aligned}
$$

Thus, the equation $x - 89 = 7$ models the problem correctly and, after solving, gives $x = 96$. This corresponds to the option:

"Write the equation as $x-89=7$ and add 89 to both sides. The answer is 96."

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