Solving Equations with More Than One Variable

Solve for a.

• a = pw

• a = p/w

• a = w/p

• a = w + p

A literal equation is an equation that has...

• one variable (letter or symbol)

• two variables

• one or more variables

• more than one variable

Solve:
a - b - c = 9 , for a

• a = b + c + 9

• a = b - c + 9

• a = -b + c + 9

• a = -b - c + 9

Solve m - n = 5 for m.

• m = 5 + n

• m = -5 - n

• m = -5 + n

• m = 5 - n

The perimeter of the rectangle shown is 36 inches. Solve for the value of x.

Tip: just type in the number.

Mathematical Equivalence

OFF

1. Kylie and Ricardo decide to start a dog watching business for their neighborhood. 

3. Kylie thinks it would be best to charge customers $27 for a membership and then $5 per time they walk a dog. 

5. Ricardo thinks it would be best to charge $8 per dog walk. 

7. For what number of walks will their two plans cost the same amount of money?

Mathematical Equivalence

ON

Kylie and Ricardo decide to start a dog watching business for their neighborhood. Kylie thinks it would be best to charge customers $27 for a membership and then $5 per time they walk a dog. Ricardo thinks it would be best to charge $8 per dog walk. For what number of walks will their two plans cost the same amount of money?

Mathematical Equivalence

ON

The perimeter of the rectangle shown is 36 inches. Solve for the value of x.

Tip: just type in the number.

Mathematical Equivalence

OFF

Solve for x:

• x = yb - v

• x = by - v

• x = by + v

Solve for y:
x + 2y = −8  

• y = − 1 /2 x − 4

• y = − 2 x − 4

• y = 1 /2 x − 4

• y = − 1 /2 x +4