PLEASE HELP ME!​

124 students

Step-by-step explanation:

Girls participating in the exercise

4/15 x 285 = 76

Boys participating in the exercise

3/20 x 320 = 48

Total students participating

76 + 48 = 124

boys

320/15=21.33 or 21 1/3x4=85 1/3

girls

14.25x3=42.75 or 42 3/4

the total combination of boys and girls

3/4+1/3=9/12 and 4/12=1 1/12+85+42= 128 1/12

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: