Given that slope = -1 and a point (3,-1), write an equation in slope- intercept form of the line,
у
X +

Y=Mx+b

Slope/M= -1
X= 3
Y= -1

-1 = -1(3)+b

-1 = -3 + b

Add +3 to -3 and -1 to cancel -3 out to get (b)

-3+3 = 0 cancel it

-1 +3 = 2

So, b = 2

In an equation it will be written as

y= -1x + 2

In standard form it will be

1x + y = 2

But your official answer will be

B= 2
Y= -1x+2