Question

Help..........

Answer 1

Triangle 2 is a reflection of triangle 1.
Triangle 1 has coordinates A (2, 4), B (4, 4) and C (2, 2).
Triangle 2 has coordinates A' (-2, 4), B' (-4, 4) and C' (-2, 2).

Which line is triangle 1 reflected over?

Answer 2

only x co-ordinates change..clearly,,reflection is over x=0 i.e. y axis//

Answer 3

so y-axis

Answer 4

the y axis
all the y-coordinates of A, B and C are still the same after reflection, and the the only change is x-coordinates. A has x-coordinate of 2 and A' has -2, so y-axis is in between this 2 point.
You can use formula too.