Spotlight Revision Practice Test

Solve 3x + 4 = 19. What is x?

x = 4 x = 5 x = 3 x = 6

Correct Answer:

x = 5

Explanation:

Isolating the variable to solve a linear equation. Start with 3x + 4 = 19. Undo the addition by subtracting 4 from both sides, giving 3x = 15. Undo the multiplication by dividing both sides by 3, yielding x = 5. So the solution is x = 5, since 3(5) + 4 = 19. Quick check: x = 4 gives 3(4) + 4 = 20, x = 3 gives 13, x = 6 gives 22, none of which equal 19.

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