The slope of a direct variation function is -4. What is the equation of the function?​

Plz hurry evaluate the expression a+b where a=8 and b=19

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket

Mr. jones determined that the equation y = 98 - 16/5 x could be used to predict his students' unit test scores, based on the number of days, x, a student was absent during the unit. what was the meaning of the y-intercept of the function? (by the way the 16/5 is a )