Answer:
0=0
Step-by-step explanation:
When you combine both expressions you multiply the first one by -3
As result all the terms in the second expression are cancelled when both expressions are added
-3x -6y = -30
3x + 6y =30
0 + 0 = 0
6)a
if we put n as the number of sides in a regular polygon, the formula to find the measure of each angle is

so the answer will be

they each measures 144 degrees
good luck
It should be B
Calculate the slopes using the change of y over the change in x
-2/2=-1
That’s the only option with a slope of -1