20) The equation of a line in the slope intercept form is expressed as
y = mx + b
Where
m represents slope
c represents y intercept. This is the point where the line cuts across the y axis.
The formula for determining slope is expressed as
m = (y2 - y1)/(x2 - x1)
From the graph,
When x1 = 1, y1 = 2
when x2 = 3, y2 = - 2
Slope, m = (- 2 - 2)/(3 - 1) = - 4/2
Slope = - 2
2) y intercept = 4
3) We would find the equation of the line by substituting m = - 2 and b = 4 into the slope intercept equation. Thus, equation of the line is
y = - 2x + 4