Question 254831
y=mx+b
b is the y intercept
line decreases by 3 when x increases by one is the slope
-3/1=3
m=slope=-3 and  b=-1
y=3x-1
{{{graph(400,400,-10,10,-10,10,y=-3x-1)}}}

3x+y+1=0 

*[invoke describe_linear_equation 3, 1, -1 ]