I just need help I don't understand

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.

Regards

Jim