A, B and C are 3 points on a line with AC=BC=12. The coordinate of C is 5. Whare the coordinates of A and B?
I am having trouble remembering how to solve this...
Here is one way.
If AC = BC, then the C must be in the middle.
Let us say A is to the left of C, so B is to the right of C.
If C is at 5, then the origin 0 is 5 units to the left of C.
A is 12 units to the left of C, so A is (12 -5) = 7 units to the left of 0.
Therefore, the coordinate of A is negative 7, or -7.
B is 12 units to the right of C, so B is (5 +12) = 17 units to the right of 0.
Therefore, the coordinate of B is positive 17, or 17 only.
Reminder, all numbers to the left of the origin 0 are negative, all to the right of the origin are positive.