Equations

An equation is modeled below. Which value of x makes this equation true?

• 3

• 4

• 2

• 8

Walter and Brian each have a CD collection. - The number of CDs in Walter’s collection can be represented by x. - The number of CDs in Brian’s collection is 3 times the number in Walter’s collection. - The total number of CDs in both collections is 144. What is x, the number of CDs in Walter’s collection?

• 108

• 48

• 72

• 36

The model represents an equation. What is the solution for the equation?

• x = 14/5

• x = 6/5

• x = 5/4

• x = 15/4

The model represents an equation. What is the solution for this equation?

• x = 3

• x = 15

• x = 5

• x = 1

Two linear equations with the same set of variables

• system of equations

• function

• association

• correlation

The model represents an equation. What value of x makes the equation true?

• 3

• 6

• 6

• 4

​ (a)   ​ ​ (b)   ​ (c)   ​ ​ (d)   ​ (e)  

• 5x

• -

• +

• 4

• 10

• 14

• x

• 5

The first step to solving this would be to ​ ​ (a)   to both sides. The next step would be to ​ ​ (b)   from both sides. The final answer is, x = ​ (c)  

• multiply 3.25

• subtract 1

• 3.51

• divide 3.25

• add 1

• 1.64

Solve for x.

x - 15 = 18

Mathematical Equivalence

ON

Solve the equation.

45 = x - 20

Mathematical Equivalence

ON