Rearrange the following equation to make x the subject, and select the correct rearrangement from th | MathCelebrity Forum

Rearrange the following equation to make x the subject, and select the correct rearrangement from th

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Rearrange the following equation to make x the subject, and select the correct rearrangement from the list below
3x + 2y 1
-------- = ---
4x + y 3

  • x = 7y/13
  • x = 7y/5
  • x = -7y
  • x = -3y
  • x = 3y/5
  • x = -5y/13
  • x = -y

Cross multiply:
3(3x - 2y) = 4x + y

Multiply the left side through
9x - 6y = 4x + y

Subtract 4x from each side and add 6y to each side
5x = 7y

Divide each side by 5 to isolate x, the subject of an equation is the variable to the left
x = 7y/5
 
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