Question

Is y=6x-3 a function

Answer 1

Yes!
Slope-intercept form, y=mx+b, of linear equations, emphasizes the slope and the y-intercept of the line.
y=6x-3 is a simple function in slope intercept form.

Answer 2

Yes it is

Explanation:

it is a linear function as it is written in the standard form Y=MX+C