D , because 28-9=21 and 21=x
Answer:
105
Step-by-step explanation:
l is parallel m so angle 3+angle 6=180
You need to convert the second equation to slope/intercept form. The first equation is in that form already. Then you can compare slopes.
-6x + 8y = 14
8y = 6x + 14
y = (3/4)x + 14/8
SO THE SLOPE IS 3/4 which is the same as slope of equation 1
Therfore they are parallel.
Answer:
80
Step-by-step explanation: