Question

Define a function f : R → R by the formula
f(x) = 6x − 8.


Prove that f is one-to-one.
Let a, b is in R, and suppose that
f(a) = f(b).
Then 6a − 8 =
a=

Answer 1

see screenshot

Answer 2

f(x) = 6x - 8
f(a) = (simply replace x with a)
f(b) = (simply replace x with b)

f(a) = f(b)
6a - 8 = ?

Answer 3

oh got it! 6b-8 and b :))) thanks

Answer 4

Awesome :)