Page 123 - Algebra 1

*15. Write Jeremy is solving the equation x - 2.5 = 7.0. What must he do to both side (19) of the equation in order to isolate x?
*16. Multiple Choice Given the information in the table, which equation best relates (19) aandb?
A a - b = 5 B a - b = -5 C -5 - b = a D a - 5 = b
17. Error Analysis Two students simplify the expression 6x + 8 - 4x - 2. Which student
a
b
-5
0
0
-5
5
-10
-10
5
(18) is correct? Explain the error.
18. Geometry Write an expression to represent the sum of the degrees in (18) the triangle.
19. Multi-Step At a family camp, the big race is on the final day. Each
(18) family member runs for t hours and the family that runs the farthest
wins. The rate each person ran is shown in the chart. To find how far they ran, multiply their rate by the amount of time they ran.
a. Write an expression to represent how far each person ran.
b. Write an expression to represent how far the family ran. c. How far did they run if each person ran _1 hour?
6
200 - 2x
3x - 170
x - 35
Student A
2x + 6 = 8x
Student B
2x + 6
Family Member
Rate (mph)
Julio
4
Jorge
5
Sam
3
20. Error Analysis Two students translate the phrase “five more than the product of a (17) number and three” into an algebraic expression. Which student is correct?
Explain the error.
*21. When x = 1.5 and y = -2, what is the value of ⎪x2 + y3⎥ ? (16)
Student A
_x + 5 3
Student B
3x + 5
108 Saxon Algebra 1