Unit 1 recap (9th)

Sign Rules

100

7 + 9

16

200

8 - 3

5

300

- 7 - 9

-16

400

-8 + 5

-3

500

-4 - (-4)

0

Order of Operations

100

(8 - 4)²

16

200

5 + (14 + 2) ÷ 4

9

300

4 + [(3 − 7) + 5²]

25

400

7 + (6 × 5² + 3)

160

500

3 ∙ 2⁴ + 5 ÷ 1³ − 7 ∙ 5 ∙ 2

-17

Substituing

100

5𝑎 + 3 𝑖𝑓 𝑎 = 4

23

200

4(8𝑎 + 6𝑏) 𝑖𝑓 𝑎 = 1; 𝑏 = −4

-64

300

5𝑥 + 7𝑦² − 2𝑧 𝑖𝑓 𝑥 = 2; 𝑦 = 1; 𝑧 = 4

9

400

(3𝑥 + 4𝑦)(𝑥 − 𝑦) 𝑖𝑓 𝑥 = 2; 𝑦 = 5

-78

500

4/3 (3𝑥 − 2) − (2 − 4𝑥); 𝑥 = 5

106/3

Similar terms

100

2𝑥 + 3𝑦 − 𝑥 + 4𝑦 + 5

𝑥 + 7𝑦 + 5

200

𝑎 + 5𝑏 − 2 − 𝑎 − 2𝑏 + 3

3𝑏 + 1

300

3𝑥² + 5𝑥 − 4𝑥² + 𝑥 − 𝑥²

−2𝑥² + 6𝑥

400

𝑥(1 + 𝑥) − 2𝑦² − (𝑥 + 2)

−2𝑦² + 𝑥² − 2

500

−10(𝑥 − 5) − 4(𝑥 + 2)

−14𝑥 + 42

Solving for x

100

4𝑥 = 24

6

200

– (7 − 4𝑥) = 9

4

300

−12 = 2 + 5𝑥 + 2𝑥

-2

400

−3(1 + 6𝑥) = 14 − 𝑥

-1

500

−10𝑥 + 3(8 + 8𝑥) = −6(𝑥 − 4)

0