How to find the point of intersection for all values of m,c and a?
Can someone please explain to me how to do question 22? Thanks!
Can someone please explain to me how to do question 22? Thanks!
1 Answer
The answer is (D). Set the two curves equal and solve for
Explanation:
To find the points of intersection of the straight line
We see from this that the curves do not intersect when the discriminant
Rearrange this condition:
If
If
So the answer is (D). Your written working on the photo shows that you're very nearly there already; you just need to note that when
NB There are two parameter regions that work, but only one is listed as an option in the question - they aren't looking for the complete solution of all possible regions, rather for you to say which of their options is part of the complete solution.