Please explain dis ah

80

Step-by-step explanation:

because if you took off a 70 or 71 it would go above 86 if you took of 85 it would be below 86 so it has to be 80

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

y=3n + 1

step-by-step explanation:

this is wrong because it says the second number is one less and i added one instead