Final answer:
The value of x when y is 4 in the equation y = 9x is 4/9.
Step-by-step explanation:
To find the value of x when y is 4 in the equation y = 9x, we can substitute y = 4 into the equation and solve for x.
- Substitute y = 4 into the equation: 4 = 9x
- Divide both sides by 9 to isolate x: x = 4/9
Therefore, the value of x when y is 4 in the equation y = 9x is 4/9.