Rewriting Equations with Multi-Variables

In the equation 2x + 3y = 19, what is/are the variable(s)? Choose the best answer.

• x

• y

• =

• Both x and y are variables

What branch of mathematics deals with equations with variables?

• Algebra

• Geometry

• Calculus

• Physics

In the equation 2x + 3y = 19, what is the constant?

• y

• 19

• x

• 2

Olivia bought a notebook for $12.50 and 9 pens. If her total was $43.73, how much was each pen?

• 12.5x +9 = 43.73

• 73.43 = 12.5x + 9

• 12.5 - 9x = 43.73

• 43.73 = 12.5 + 9x

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

• 4

• 3

• 2

• 1

3a + 9 + 4a = 2

• -1

• 1

• no solution

• -7

2x - 3 + 4x = 27

• 12

• 4

• 5

• 15

8v - 4(v + 8) = 8

• 2

• 10

• 4

• -4 

-11 + 3(b + 5) = 7

• 1

• -1

• 3

• -3