Junior high classes of 20 students each met in the cafeteria to take achievement tests. If exactly 7 students sat at each table and 20 tables were used, how many classes took the tests?

step-by-step explanation:

your answer is a

what is the approximate solution for the system of equations x+5y=10 and 3x+y=1

step-by-step explanation:

tell me the answer first then i will answer it

let

step

find the slope of the line ab

we know that

the formula to calculate the slope between two points is equal to

substitute the values

step

find the equation of the line ab with the slope m and point a

we know that

the equation of the line in the slope-point form is equal to

substitute the values

convert to function form

let

therefore

the answer is the option

see the attached figure to better understand the problem