IBEW Solving Linear Equations 2

Question 1

Solve for x: 3x - 7 = 14

Accepted Answer

x = 7

Answer

Add 7 to both sides: 3x = 21, then divide by 3: x = 7.

Question 2

An electrician earns $28 per hour plus a $50 flat fee per job. If she earned $330 on a job, how many hours did she work?

Accepted Answer

10 hours

Answer

Set up 28h + 50 = 330, so 28h = 280, giving h = 10 hours.

Question 3

Solve for y: 5y + 3 = 3y + 11

Accepted Answer

y = 4

Answer

Subtract 3y from both sides: 2y + 3 = 11, then subtract 3 and divide: y = 4.

Question 4

If 2(x + 4) = 18, what is x?

Accepted Answer

x = 5

Answer

Divide both sides by 2: x + 4 = 9, then subtract 4: x = 5.

Question 5

Solve for x: x/4 + 6 = 10

Accepted Answer

x = 16

Answer

Subtract 6 from both sides: x/4 = 4, then multiply by 4: x = 16.

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