2a+b=-7
5a+b=-13
b=-2a-7
5a-2a-7=-13
3a=-6
a=-2=first number
2(-2)+b=-7
-4+b+-7
b=-3=second
Infinitely many because if you subtract 7x from both sides, you get 4 = 4, which is true at all times no matter what x is.
It is 80% just writing random things so it can be 20 words
16, 18, 23, 25, 26, 34, 37, 37, 40, 41, 46
37 is the upper quartile value
