8th Grade Math Chapter 1 Review

Single-Step Equation

100

x+5=12

x=7

200

2n=10

n=5

300

r-3=7

r=10

400

7b=98

b=14

500

m/12=13

m=156

Multi-Step Equation

100

3x+4=16

x=4

200

5x-3=22

x=5

300

2(x+3)=14

x=4

400

1/2(s-8)=6

s=20

500

7-2(y-1)=3

y=3

Equation With Variable on Both Sides

100

x+10=2x+4

x=16

200

2p-3=p+1

p=4

300

4t+2=2(t+5)

t=4

400

q+4=q+10

No possible answer.

500

2-5(d-6)=1/2(-10d+16)+24

Infinite Possible Answers

Rewriting Equations

100

2=3x-y

y=3x-2

200

6x=2y+12

3x-6=y

300

2(x-4)-3y=14

(2x-22)/3=y

400

1-3(2y-4)=3(x+1)

(-3x+10)/6=y

500

1.5x-3y=5y-3x

(3.5x)/8=y

Geometric Figure Formula

100

Area of a triangle

A=1/2bh

200

Circumference

C=d𝛑 or C=2r𝛑

300

Area of a trapezoid

A=1/2(b₁+b₂)h

400

Volume of a cone

V=1/3𝛑r²h

500

Hypotenuse of a right triangle

c²=a²+b²