Question

Triangle RST

has coordinates R(−4, 0)
, S(−1, 3)
, and T(2, 2)
. The triangle is reflected across the x-axis.


Write the coordinate notation for a reflection across the x-axis.



(x, y)→(

Answer 1

(x, y)→(x,-y)

R(-4,0) S(-1,-3) T(2,-2)

Explanation:

The opposite of a number is made by multiplying it by negative 1 (-1)

If it's reflected across the x axis, then the y axis will be the only one to change. (y to -y)

(x, y)→(x,-y)

Our formula for reflection across the x axis is (x,-y)

The rest is simple: Change each set of coordinates to an opposite y value.