I'm gonna do this 2 ways because I'm not sure what you mean about the line. I'm going to indicate greater than or equal to with >=.
1st I'll solve for
r/15 >= -3
multiply by 15 on each side
r >= -45
Next I'll solve for
r/15 >= 3
multiply 15 on each side
r >= 45
So depending on if that is a 3 or -3 that is how you would do it....
So did I read the problem right?
Answer:
38.91.
Im not sure but let me know if it's wrong
round it to 34%
Total students = 24
students earning an A= 14
Probability = 14/24 = 7/12
Subject : Linear Equations
→ Use Elimination:
-9x + 3y = -6
-9x + 2y = -10
__________ ---
0 + y = 4
y = 4
→ Use substitution:
-9x + 3y = -6
-9x + 3(4) = -6
-9x + 12 = -6
-9x = -6 - 12
-9x = -18
x = -18/-9
x = 2
So the value of x = 2 and y = 4
I hope this helps...