Can y’all help me on this question.

43lbs of tomatos cost $387. how much would 41lbs cost

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

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 )