Question

Consider the equation – 17 + 3u = 13. What two inverse steps would solve the equation for u. Specifically, what are the two steps, in order, if one isolates the variable term with the first step?

A: divide by 3; add 17
B: subtract 17; divide by 3
C: subtract 3u; subtract 13
D: add 17; divide by 3

Answer 1

D

Explanation:

You undo the adding or subtracting first and then undo multiplying or dividing

-17 + 3u = 13 Add 17 to both sides

3u = 30 Divide both sides by 3

u = 10

Substitute 10 for u for the check

-17 + 3u = 13

-17 + 3(10) = 13

-17 + 30 = 13

13 = 13

Answer 2

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