G8

Copyright © Swun MathCopyright © Swun Math Grade 8 Unit 4 Lesson 11 P TE

Answer Key

Extension Activity

x= nickels and because nickels are worth five cents, the value of nickels is 5x. Dimes depend on nickels, so

dimes will equal 4 + 3x, but because dimes are worth ten cents, they will be expressed as 10(4 + 3x). The

equation for how many nickels and dimes is:

5 푥푥+10(4 + 3푥푥) = 460

5 푥푥+ 40 + 30 푥푥= 460 or 35 푥푥+ 40 = 460

35 푥푥= 420

x= 12 nickels

Homework

1. 4 + 7x = 130; x = 18
   2. (2 x p) + 2 = 48; p = 23


2. x + 4x = 26.40; x (first book) = $5.28; 4x (second
   book) = $21.12
   4.^15 푥푥 = 65 ; x = 325 people surveyed


3. x + 2x + $575.25; x = $191.75 (Amy’s phone); 2x =
   $383.50 (Jill’s phone)
   5.^23 푥푥 +^12 푥푥= 56 ; x = 48 games; 32 gopher wins; 24
   rattler wins