Find the equation of the line passing through the two points (2,8),(6,1)
To find the equation of the line passing through the points (2,8) and (6,1), follow the steps below:
- Step 1: Calculate the slope m.
The formula for the slope m is:
m=x2−x1y2−y1=6−21−8=4−7
- Step 2: Use the point-slope form to write the equation of the line.
The point-slope form of a line is given by:
y−y1=m(x−x1)
Using the point (2,8):
y−8=−47(x−2)
- Step 3: Simplify to the slope-intercept form.
Distribute the slope and rearrange to find y:
y−8=−47x+27
Add 8 to both sides to solve for y:
y=−47x+27+8
Convert 8 to a fraction with a denominator of 2:
y=−47x+27+216
Simplify the addition:
y=−47x+223
To convert 23/2 into mixed number form: 223=1121
Thus, the equation in slope-intercept form is: y=−47x+1121
Therefore, the equation of the line passing through these points is y=−143x+1121, which matches the correct choice in the multiple-choice answers.
y=−143x+1121