MathsFormula
Junior Member
- Joined
- Jul 13, 2014
- Messages
- 94
Question is :
(i) Find the gradient of the line joining points (2m, n) and (3, -4)
This bit I did correct:
Gradient = (difference in y-coordinates) / (difference in x-coordinates)
(2m, n) = the difference in coordinates (subtraction sum)
- (3, -4)
(2m-3), (n+4) = the difference in coordinates
Gradient = (difference in y-coordinates) / (difference in x-coordinates)
(n+4) = gradient CORRECT ANSWER
(2m-3)
(ii) Find the value of n if the line is parallel to the x-axis
This bit I did correct:
The line is therefore horizontal so gradient = 0
(n+4) = 0
(2m-3)
n = -4 CORRECT ANSWER
(iii) Find the value of m if the line is parallel to the y-axis
Here is where I'm confused. I got the correct answer but don't understand why. Please help
The line is therefore vertical so gradient = 1 ????
(n+4) = gradient
(2m-3)
(n+4) = 1
(2m-3)
We know n = -4 from part (ii) then
(-4+4) = 1
(2m-3)
0 ___ = 1 THE LEFT SIDE IS ZERO
(2m-3)
0 = 1 The 'm' vanishes
What's going on? Please help. Answer = 1.5
If I ignore that the left side is zero and just say 0 =(2m - 3) then I can get the correct answer
Thank you
(i) Find the gradient of the line joining points (2m, n) and (3, -4)
This bit I did correct:
Gradient = (difference in y-coordinates) / (difference in x-coordinates)
(2m, n) = the difference in coordinates (subtraction sum)
- (3, -4)
(2m-3), (n+4) = the difference in coordinates
Gradient = (difference in y-coordinates) / (difference in x-coordinates)
(n+4) = gradient CORRECT ANSWER
(2m-3)
(ii) Find the value of n if the line is parallel to the x-axis
This bit I did correct:
The line is therefore horizontal so gradient = 0
(n+4) = 0
(2m-3)
n = -4 CORRECT ANSWER
(iii) Find the value of m if the line is parallel to the y-axis
Here is where I'm confused. I got the correct answer but don't understand why. Please help
The line is therefore vertical so gradient = 1 ????
(n+4) = gradient
(2m-3)
(n+4) = 1
(2m-3)
We know n = -4 from part (ii) then
(-4+4) = 1
(2m-3)
0 ___ = 1 THE LEFT SIDE IS ZERO
(2m-3)
0 = 1 The 'm' vanishes
What's going on? Please help. Answer = 1.5
If I ignore that the left side is zero and just say 0 =(2m - 3) then I can get the correct answer
Thank you