Leon correctly found the slope and y-intercept of the line that passes through the points (9, –8) and (3, 4) as follows.

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The slope equation is: y2 - y1/ x2-x1. You can plug in the values 4- (-8)/ 3 - 9. That is 12/-6 which equals -2. Your slope is negative 2. 

Your y intercept can be found when you graph, and it is when x equals 0. Your y intercept would be 10. Now your equation is y = -2x + 10.

The second and fourth answer are correct