Final answer:
The value of x when y = 0 is 7/4.
Step-by-step explanation:
To find the value of x when y = 0, we can substitute the value of y into the given equation and solve for x. So, when y = 0, the equation becomes:
4x - 1(0) = 7
4x = 7
x = 7/4
Therefore, the value of x when y = 0 is 7/4.