Question

Bella is baking 42 cookies for the holiday party tonight. She baked 29 before leaving for school and will bake the rest when she returns home.

Which equation shows how many cookies Bella will bake when she returns home?

42 = x + 29
42 = x − 29
42 = 29x
29 = x − 42

Answer 1

(a) 42 = x + 29

Explanation:

You want the equation showing how many cookies (x) Bella will bake when she returns home, adding to the 29 she already baked, to make a total of 42 cookies.

Equation

The numbers of cookies baked (29) and cookies to be baked (x) will add up to give a total of 42 cookies:

42 = x + 29

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Additional comment

We know the value of x will be found by subtracting 29 from 42.

x = 42 -29 . . . . . . subtract 29 from both sides of the above equation

x = 13

This knowledge might tempt one to choose one of the answers involving subtraction. Here, the question is not about the value of x. It is about the relationship between the numbers 42, 29, and x. The purpose of the equation is to describe that relationship.

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