Answer:
Note what a function is: "Assigning one answer for the output for every input".
Part A:
Yes, for each Input (x) has only one Output (y).
Part B:
When x = 8 in the table, y = 4
Plug in 8 for x in f(x) = 3x - 10.
f(x) = 3(8) - 10
f(x) = 24 - 10
f(x) = 14
14 > 4 ∴ f(x) = 3x - 10 is greater.
Part C:
We are using the relation f(x) = 3x - 10
f(x) = 80 (Given). Plug in 80 for f(x) and solve for x
80 = 3x - 10
Add 10 to both sides
80 (+10) = 3x - 10 (+10)
80 + 10 = 3x
90 = 3x
Divide 3 from both sides
(90)/3 = (3x)/3
x = 90/3
x = 30
30 is the value for x.
~