Solving one and two-step equations

Solving One and Two-Step Equations

Fill in the Blank

Solve for u.

u − 9 = 5

Solve.

u − 9 = 5

u − 9 + 9 = 5 + 9 (Add 9 to both sides)

u = 14 (Simplify)

To solve for a variable, use inverse operations to undo the operations in the equation. Be sure to do the same operation to both sides of the equation.

Fill in the Blank

Solve for z.

17 = z + 2

Solve.

17 = z + 2

17 − 2 = z + 2 − 2 (Subtract 2 from both sides)

15 = z (Simplify)

To solve for a variable, use inverse operations to undo the operations in the equation. Be sure to do the same operation to both sides of the equation.

Multiple Choice

Solve for b.

b − 6 = 7

• b = 1

• b = 42

• b = 13

Solve.

b − 6 = 7

b − 6 + 6 = 7 + 6 (Add 6 to both sides)

b = 13 (Simplify)

To solve for a variable, use inverse operations to undo the operations in the equation. Be sure to do the same operation to both sides of the equation.

Multiple Choice

 Solve for n.

 $\frac{n}{4}$   − 3 = 2

• n = 20

• n = 5

• n = 9

Solve.

 $\frac{n}{4}$  − 3 = 2

 $\frac{n}{4}$   − 3 + 3 = 2 + 3 (Add 3 to both sides)

 $\frac{n}{4}$   = 5 (Simplify)

 $\frac{n}{4}$   · 4 = 5 · 4 (Multiply both sides by 4)

n = 20 (Simplify)

Poll

 $\frac{35}{u}$ = 5

Solve for u: 

• 7

• 40

 $\frac{35}{u}=5$  

 $u\times35=5\times u$  or  $35=5u$  


 $\frac{35}{5}=u$  ......?

Fill in the Blank

 $\frac{35}{5}=u$  

so  $u=$  ?

Multiple Choice

Solve for b.

5b − 11 = 9

• $b=4$

• $b=12$

To solve for a variable, use inverse operations to undo the operations in the equation. Be sure to do the same operation to both sides of the equation.

5b − 11 = 9
5b − 11 + 11 = 9 + 11 (Add 11 to both sides)
5b = 20 (Simplify)
 $\frac{5b}{5}=\frac{20}{5}$   (Divide both sides by 5)
b = 4 (Simplify)