Question 1104037
You ask about three different equations in two variables.  Here is a look at ONLY your first equation.

THESE will be the points according to the x value:
{{{y=5x}}}
-
(-1,-5)
(0,0)
(1,5)
(2,10)
(3,15)


So you miscalculated almost everything in your list.



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 using the points from equation y=-3(5^(x+4))+2 I must plot the points to create a graph,
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So CHOOSE some x values and compute or evaluate the corresponding y values.  You DO this!  You already have the formula.  Just use it.