Solving Equations Practice

Which step is incorrect?

120 = –4(7a + 2)

Step 1: 120 = –28a – 8

Step 2: 112 = –28a

Step 3: a = –4

• Problem is correct

• step 1

• step 2

• step 3

Which step is incorrect?

2(1 – 5n) = –30 – 2n

Step 1: 2 – 7n = –30 – 2n

Step 2: 2 = –30 + 5n

Step 3: 32 = 5n

Step 4: 6.2 = n

• step 1

• step 2

• step 3

• problem is correct

Solve.

7 + 4x + 4x = 8x + 3 + 4

• no solution

• infinite solutions

• 7

• 3

Solve

7 + 3x = 14 + 3x

• infinite solutions

• no solution

• 5

• 9

3a + 9 + 4a = 2

• –1

• 1

• no solution

• –7

–15 = 5a + 12 – 2a + 6

• –11

• –3

• 10

• 7

4(a + 3) = –32

• –11

• –44

• –20

• –8

2 + 14a = –8 + 9a

• –2

• 3

• 5

• –10

Identify if this equation has one solution, infinitely many solutions or no solution.

–3x + 1 = x + 9 – 4x

• one solution

• infinitely many

• no solution

3x + 2(4x – 4) = 3

• 4

• 3

• 2

• 1