Final answer:
To make x the subject of the equation y = 9 + 3x, you need to isolate x on one side of the equation.
Step-by-step explanation:
To rearrange the equation y = 9 + 3x to make x the subject, we need to isolate x on one side of the equation. Here are the steps:
- Subtract 9 from both sides of the equation: y - 9 = 3x
- Divide both sides of the equation by 3: (y - 9) / 3 = x
- Swap x and (y - 9) to make x the subject: x = (y - 9) / 3
Now the equation is rearranged so that x is the subject.