Mathematics
Grade10
Easy
Question
Given the graph, find the equation of the line in point slope form.
- y - 20 = ½ (x - 4)
- y - 20 = 5(x - 4)
- y + 20= 5(x + 4)
- y - 20 = 1(x - 4)
Hint:
Given the graph the slope will be
m = 
and equation y - y1 = m (x - x1) is the point–slope .
The correct answer is: y - 20 = 5(x - 4)
Taking point (0 , 0 ) and (4,20)
Step 1 : slope is =
= 20-0/4-0 = 5
From the graph m is 5
Step 2 : point is (4,20)
y - y1 = m (x - x1) is the point–slope form of the equation of a line.
So, Substituting the values
equation of line is y - 20 = 5(x - 4) .
First find the slope using any two clear points .
Then using one point and slope construct the equation in point slope form .
