Solving Linear Equations Word Problems

After paying $5.12 for a salad, Kamauri has $27.10. How much money did he have before buying the salad?

• n + $5.12 = $27.10

• n - $5.12 = $27.10

• n - $5.12 = -$27.10

• $5.12 - n = $27.10

Which equation would describe "two times a number plus five equals 15"?

• x + 5 = 15

• 2x + 5=15

• x + 2(5) = 15

• 2(x + 5) = 15

For a field trip 4 students rode in cars and the rest filled nine buses. How many students were in each bus if 472 students were on the trip?

• 4x=472

• 9x=472

• 4+9x=472

• 4+x=472

We are going to manufacture Whats-Its. The Whats-It machine costs $4000.It also costs $5 for materials and labor for each Whats-It. We are planning to sell our Whats-Its for $12 each. How many Whats-Its must we sell in order to break even? What is the expression for cost?

• 4000+5

• 4000x + 5

• 5x + 4000

• 4000x + 5x

Which equation models the situation below? The sum of a number and 5 is multiplied by -3 and the answer is -24. Find the number.

The sum of a number and 5 is multiplied by -3 and the answer is -24. Find the number.

• 13

• -13

• 3

• -3

Which equation models the situation below? The difference of a number and 3 is multiplied by -2 and the answer is -10. Find the number.

The difference of a number and 3 is multiplied by -2 and the answer is -10. Find the number.

• 8

• -8

• 2

• -2

Which equation models the problem given? Oberon Cell Phone Company advertises service for $0.03 per minute plus a monthly fee of $29.95. If Luke’s phone bill for October was $38.95, find the number of minutes he used.

Oberon Cell Phone Company advertises service for $0.03 per minute plus a monthly fee of $29.95. If Luke’s phone bill for October was $38.95, find the number of minutes he used.

• 30 minutes

• 300 minutes

• 9 minutes

• 90 minutes