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slope intercept form of a line is : y = mx + c
here, m is slope and c is intercept
Now, (2,9) and (4,-1) will give us slope
m = (9-(-1)) / (2-4)
m = 10/-2
m = -5
so, y = -5x + c
put (2,9) in the equation
9 = -10+c
c = 19
so, final equation in slope intercept form is
y = -5x + 19
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