Arthur writes the equation a=10b−7. He wants to rewrite it in terms of b. In Arthur’s first step, what value should he add to both sides of the equation?

Answer 1

To rewrite the equation \( a = 10b - 7 \) in terms of \( b \), Arthur can start by isolating the term involving \( b \).

To do that, he should add \( 7 \) to both sides of the equation. This gives:

\[ a + 7 = 10b \]

This is the first step in isolating \( b \). After this step, he can then divide both sides by \( 10 \) to solve for \( b \).