Final answer:
The equation y = 4 can be written in the form y = kx, where k = 0 and x can be any value.
Step-by-step explanation:
The equation y = kx represents a linear equation in slope-intercept form, where k is the slope of the line.
Out of the given options:
- (A) y = 52 + 1 cannot be written in the form y = kx as it does not have a variable x.
- (B) y = 4 can be written in the form y = kx, where k = 0 and x can be any value.
- (C) 1 - 1 = y cannot be written in the form y = kx as it does not have a variable x.
Therefore, the equation that can be written in the form y = kx is (B) y = 4.