Lesson 2-6 for exercise sets. &KDSWHU
3UDFWLFH $FWLYLWLHV
Solve:|54| 9 x
54 9 9 x 9
6 x
Divide both sides by 9
to isolate xand simplify.
2 Check:|54| 9 x
54 9(6) Substitute 6 for x.
54 54 Tr u e
?
Kaela opens a savings account and decides to deposit $28 each week.
How long will it take her to save $700?
Let wthe number of weeks.
Solve: 28 w 700
28 • w 28 700 28
w 25
Check: 28 w 700
28(25) 700 Substitute 25 for w.
700 700 Tr u e
So it will take 25 weeks for Kaela to save $700.
?
Divide both sides by 28 to isolate w.
Then simplify.
3
Sometimes you need to combine like terms before solving an equation.
Solve:n 3 n 28
4 n 28 Combine like terms (1n 3 n).
Divide both sides by 4 to isolate nand simplify.
n 7
Check:n 3 n 28
7 3(7) 28 Substitute 7 for n.
7 21 28 Simplify.
28 28 Tr u e
Solve and check.
- 4 x 124 2. 5 ss 48 3. 96 3 y
4. 24 x|72| 5. 6 zz 29 13 6. 144 12 n
7. 225 14 tt 8.x 36 9.x 3 x 32
- 3 (5) 14 z 11.(2)^2 x 12. 4 x|24|
13.Discuss and Write What property would you use to solve –5a= 30?
Explain your reasoning.
?
?
28
4
4 • n
4