Answer:
40°, 140°, and 140°
Step-by-step explanation:
There are 63 students in the room, this is because 21 time 3 gives you 63.
Answer:
3
Step-by-step explanation:
subtract 3y from both sides
add 9 to both sides
3y=12x+9
divide everything by 3
y=4x+3
y-intercept is 3