Francesca tried to evaluate an expression. Here is her work: 3(5)2–18÷3
=
3(25)–18÷3 Step 1
=
75–18÷3 Step 2
=
57÷3 Step 3
=
19 Step 4
Is Francesca's work correct?

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

fwms@lil_ben06

step-by-step explanation: