Solving Equations with 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

How do we figure out the value of a variable?

• Add up all the numbers in the equation.

• Multiply the variable by itself.

• Isolate the variable on one side of the equals sign.

• A variable has no set value.

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

• y

• 19

• x

• 2

Solve for y:
2x + 2y = 6

• y = - x + 3

• y = x + 3

• y = 2x +6

• y = - 2x + 6

• (0,445)

• (0.50, 435)

• (233, 21)

• (118, 209)

• (172, 101)

-4=-x+2y 

•  x-2y=4

• x-2y=-4 

• 4=x-2y 

• x+2y=4 

3x + 2y = -2

Solve -7x + 7y = 21 for y

• y = 3x + 3

• y = -3x + 3

• y = x + 3

• y = x - 3

Which of the following is equivalent to 4x - 3y = 15?