Write an equation for the description.
Ten times the sum of half a number x and 7 is 9.

10( 1/2x + 7) = 9

Step-by-step explanation:

This is the answer because:

1) 10 times the sum is representing 10 multiplied by the sum of two numbers

2) The sum of half a number x and 7 is 1/2x + 7 because you have to figure out 1/2 of x first and then add it with 7

3) This whole entire expression is supposed to equal to 9, so the final answer is 10( 1/2x + 7) = 9

4) 1/2x + 7 is in parenthesis because you have to figure out the sum of those two number and then multiply it with 10

Hope this helps!

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