Math Review 8th grade equations

Word problems

100

Jimmy has 3 apples that each cost $5, how much money would 5 apples cost him?

$25

200

Write an equation representing this story:

Anita moves at a constant speed of 4.5 miles per hour after being dropped off 5 miles from her house

y=4.5x+5

300

Diego has $11 and begins saving $5 each week to buy a phone. At the same time that Diego starts saving, Lin has $60 and begins spending $2 per week on supplies for her art class. 

Write an equation showing these 2 peoples money. Hint:
y=
y=

y=11 +5x

y= 60-2x

400

Han was looking at the equation 6x-4+2(5x+2)=16x. He said that he could tell there are no solutions because you will have 6x+10x and a bunch of constants, but you just have 16x on the other side. Do you agree or disagree? Why or why not?

Disagree because if you work out all the constants you would have 16x+0=16x, which is equal.

500

Anthony and Jimmy are each saving money. Anthony starts with $100 in his account and adds $5 per week. Jimmy starts with $10 in his account and adds $20 each week. 

After 4 weeks who has more money? How do you know?

Anthony has more money because 100+ 5(4)= $120

while Jimmy has 10+ 20(4)= $90

Simple equations

100

Solve this equation

3(x-4)

3x-12

200

Solve: -2(x-4)+62

-2x+70

300

Solve: 10(3x-1) - (13x-9)

17x-1

400

Solve: -5(-3x+28) - (x+3z)

14x-3z-140

500

Solve: -x(3+5) + 5(x-4) - 6(x-z)

-9x+6z-20

Not as simple equations

100

Find y when x is 2.5:

y= x+10

12.5

200

Does this equation have 1 solution or no solutions?

y=3x+ 1

y= -3x+7

1 solution

300

Tell me how many solutions this set of equations has. Is it 1 solution, no solutions, or infinite solutions?

y= 3x + 6

y-6= 3x

Infinite Solutions

400

Find x and y

3x + 4y =36

y = -1/2x + 8

x=4

y=6

500

Solve this equation: (solve for x)

1/2x -7 =1/3(x-12)

x=18

Find the missing value

100

100 +5n = 10 + 20n

n=6

200

Find the value to make these equations equal

3x+3= __(-x-1)

-3

300

Is (6,2) a solution for this equation? Yes or no?

y=-1/6x+3

Yes

2=2

400

Find the missing values to make these equations equal

15x+ ___= ___(3x+5)

15x+ 25= 5(3x+5)

500

Solve for x:

2x+21= 12+5x

x=3

Random!

100

What is 1+1=?

2 or window

200

If someone was born in 1990, how old are they in 2027?

37

300

What is the difference between these 2 numbers?

5,305 and 2,598

2,707

400

What is 3,986 rounded to the nearest tenth?

3,990

500

Find x:

4x-3(x-9)+6= 16

17