Writing Equations to Find Unknowns

Which phrase is usually associated with addition?

the total of two numbers

For which equations is 8 a solution? Check all that apply.

x + 2 = 10 x - 4 = 4 3x = 24 x/8 = 1

Roberto wrote a sentence that describes an equation. Half of a number is 45. Which choice shows Roberto's equation and its solution?

x/2 = 45; x = 90

Which answer choice contains only equations?

2 + h = 14 and k - 25 = 2

Which equation represents "the product of a number and 24 is 72"?

24p = 72

LaTricia wrote a sentence as an equation. Twelve is the product of three and a number. 12w = 3 Which statement best describes LaTricia's work?

LaTricia is not correct. The word product does mean to multiply, but 12 should be the product and 3 should be one of the factors.

Which sentence could be used to describe the equation 105 = 78 + y?

The sum of 78 and a number is 105.

Which sentence can be represented by the equation 3/5m = 15?

Three-fifths times a number is 15.

Collin did the work to see if 10 is a solution to the equation r/4 = 2.5. r/4 = 2.5 10/4 = 2.5 2.5 = 2.5 Is 10 a solution to the equation?

Yes, because if you substitute 10 for r in the equation and simplify, you find that the equation is true.

Which phrase can be represented by an equation?

half of a number is 15