B. it’s the change in y over the change in x
4x+2x=180
6x= 180
Divide by 6
X= 30
Answer:
DEC+DEF=180
DEC=180-116
DEC=64°
in triangle DCE
angle D+angle C+angle E=180
7y+6+4y+64=180
11y+70=180
11y=180-70
11y=110
y=110/11
y=10°
angle C=4y
=4(10)
=40°
6w-y=2z
6w=2z+y
w=(2z+y):6
w=(z:3)+(y:6)
