Could you please explain how to work this app
15 + 2x - 4 = 9x + 11 - 7x
2x + 11 = 2x + 11
always true
2x + 3(4x - 1) = 2(5x + 3) + 4x
2x + 12x - 3 = 10x + 6 + 4x
14x - 3 = 14x + 6
never true
The y-coordinate is between -1 and -2. It is close to halfway between -1 and -2, but it is a little less than halfway.
Answer: Choice B. 
Answer:
pls dont kill me for wacky lines. this shall just give you a basic idea. the important part is the 90° angle
X=6
y=7
6+7
= 13
1/2(6) + 7
= 3 +7
=10