Question

Graph the image of the given triangle after the transformation with the rule (x, y)→(x, −y).

Answer 1

Is this 9th grade math?

Answer 2

its quite simple.... moving from y to -y means you swap the sign of the y- value

and the x values remains the same

so given the point (2, 3) x remains the same and swap the sign of y so it's (2, -3)

apply this to the other points so you can draw the triangle