Given the slope and a point on the line, use the point-slope formula for the equation of a straight line.
y-6 = (-5/9)(x-9)
This can be put into other forms. For example,
Multiplying all terms by 9 results in 9y - 54 = -5(x-9) = -5x + 45
Solving for y: 9y - 54 = -5x + 45
+54 = +54
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9y = -5x + 99
Then y = (-5/9)x + 11.