What is the equation of a line that goes through (2,5) and (-2,3)?

First, we need to find the slope.
m = 
m =
m =
m = -2

Next, write the standard line equation:
y = mx + b
Now fill in what you know (pick a coordinate point, it does not matter):
5 = -2(2) + b
Simplify to solve for b:
5 = -4 + b
+4  +4
9 = b

Rewrite the equation:
y = -2x + 9

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