Multiple choice

If 9x-3y=12 and 3x-5y=7 then 6x-2y = ?

  1. -5

  2. 4

  3. 2

  4. 8

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

From 9x - 3y = 12, divide by 3: 3x - y = 4. From 3x - 5y = 7. Solving these simultaneously: Subtract second from first: 4y = -3, so y = -3/4. Then 3x = 4 + y = 13/4, x = 13/12. Therefore 6x - 2y = 2(3x - y) = 2(4) = 8.

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