Find the slope and te y intercept y=-5x

This equation is written in slope intercept form (y=mx+b where m is slope and b in the y intercept).

The m value here is -5 so that is the slope.
The b value here is 0 so the y intercept is at 0.

You can also find this by plugging 0 for the value of x.
y= -5(0)
y= 0

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)

Where is the expression you want us to evaluate?