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how do I write this equation in slope intercept form. -3x+3y greater than or equal to 69

I just need help I don't understand

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Jim S. | Physics (and math) are fun, reallyPhysics (and math) are fun, really
4.7 4.7 (185 lesson ratings) (185)
Starting with -3x + 3y≥69 we can factor out a 3 and divide both sides of the equation by 3 which gives
-x + y≥23. The slope intercept form is y = mx + b where m is the slope and b is the intercept. Solving our inequality  for y gives 
y ≥ x + 23 which is the answer.