Answer: y=-2x+10
Step-by-step explanation:
The equation of a straight line can be represented in the slope-intercept form, y = mx + c
Where c = intercept
Slope, m =change in value of y on the vertical axis / change in value of x on the horizontal axis
change in the value of y = y2 - y1
Change in value of x = x2 -x1
y2 = final value of y
y 1 = initial value of y
x2 = final value of x
x1 = initial value of x
The line passes through (9,-8) and (3,4),
y2 = 4
y1 = - 8
x2 = 3
x1 = 9
Slope,m = (4 - - 8)/(3 - 9) = 12/- 6 = -2
To determine the intercept, we would substitute x = 9, y = - 8 and m= - 2 into y = mx + c. It becomes
- 8 = - 2 × 9 + c = - 18 + c
c = - 8 + 18 = 10
The equation becomes
y = - 2x + 10
