Question

y=-3x+4

Answer 1

If you want to graph it, just search the equation on google. If you want the solution, the answer is y is infinite, it can be any number.

Answer 2

This is in slope intercept form. y=mx+b
m is the slope of the line
b is the y-intercept of the line.

So this is the equation for a line that starts at (4,0) and goes up and down from there with a slope of -3/1.