We can use two functions to compare/contrast.
First the parent function y = x^2 and then using a = 2 (which is >1), we can use y = 2x^2.

The blue is the original function of x^2 and the red is 2x^2.
The two questions to ask about the red:
Does it open upward or downward?
Is it wider or narrower than the blue?

That’s it!

Minimum value means y value.
So we find the lowest point which is at (-3,-2) and the answer is the y value!
We can confirm this by looking at the table for the lowest value of Y.

What word is in the word linear?
An easy  way to see if a function is linear is a constant rate of change!
Since all the x’s are the same x = 1,2,3,4 , we can focus on the y values!
Which table has y-values that are the same distance apart?
That’s it!  2 more points

The answer would be in Celsius so only answers (1) and (3) are possible.  Now plug in or substitute 68 into the equation: 5/9(68-32) = 5/9(36) = 20
So 68 F = 20 C  That’s it — 2 points!!!