A/3=7/10
21=10a
a=2.1
100a=100*2.1=210
The midpoint of the line having the endpoints

and

is

basically average them
so given that the line has the endpoints of (-3,7) and (9,-2)
x₁=-3
y₁=7
x₂=9
y₂=-2
so the midpoint can be found by doing



the midpoint is
Answer:
I think it's A - (0,-3)
Step-by-step explanation:
x,y
(0,-3)
y-intercept equation for this problem:

Break it down to smaller parts:


Rewriting it in a neater way:
=> 
Therefore, answer A / the first choice is correct
- have a great day, be safe & healthy -