Answer:
y=1.3 x - 0.21
Step-by-step explanation:

set (-2.3,-3.2) in above

then c=-0.21
For (A.) Get a common denominator, 40/12 - 9/12 = 31/12 or (2 and 7/12)
For (B.) Get a common denominator, 24/15 - 10/15 = 14/15 (Simplified)
For (C.) Get a common denominator, 51/30 - 25/30 = 26/30 or (13/15)
For (D.) Get a common denominator, 14/6 - 9/6 = 5/6 (Simplified)
Hope this helps!
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This function, y=8x+7 is linear with a slope (m) =8.
Any other function with slope m = 8 could be the other equation
Example:
y=8x+10
y=8x-5/3
y=8x+10,000
etc.
In short there are an infinity of function