thx for help
how would you do these questions i cant be able to figure them out
1)A line passes through the points (−8, −5), (4, −3) and (a, 12). Find the value of a.
An altnernative approach to that of Nato would be that the gradient between each of the points must be the same i.e.
Knowing this we can equate 2 of these (if 2 are the same, then all 3 will be) to find the value of
2)The points (2, 7) and (6, 9) lie on the same straight line. Does the point (4,8) also lie on this line?
The same again here, check whether 2 of the following hold:
Therefore it does lie on the line.
*Note: You could also just do this by inspection. The points (2,7),(4,8),(6,9) obviously follow a linear trend.
Edit:
Can someone help me with this question? Thanks a lot
You have three points on the parabola.
1. The left most point: (0,75)
2. The local minimum: (90,30)
3. The right most point (following symmetry): (180,75)
You can put these into the equation
and solve for
.
Alternatively you could have it in the form
and sub in one of the end points.