Reflecting across the x axis maintains the same x coordinate, but changes the sign of the y coordinate.
So, the transformation is

Answer:
9 sides
Step-by-step explanation:
Given the sum of the interior angles = 1260°, then
180° (n - 2) = 1260 ( divide both sides by 180 )
n - 2 = 7 ( add 2 to both sides ), hence
n = 9
Answer:
x = -16.
Step-by-step explanation:
x/-4 - (-8) = 12
x/-4 + 8 = 12
x/-4 = 12 - 8
x/-4 = 4
Cross multiply:
x = -4 * 4
x = -16.
First you solve for X then substitute the number you got for X and then solve for Y.