Equations of straight lines

Question

It is given that the straight line L with slope - 1 passes through the point A (-1,2).

Does L cut the positive y-axis? Explain your answer.

Answer 1

equation of line is

y = mx + b

m= slope = -1

b=y-intercept

y =-x +b

2 =-(-1) +b

2 =1+b

b=1

y= -x + 1

b=1

sp line L cuts y axis at (1,0)

b= y