John is 5 years older than mary. in 10 years, twice john's age decreased by mary's age is 35, and john's age will be
twice mary's current age. find their ages now
if xis mary's age now and y is john's age now, which system of equations could not be used to solve the problem?
y= x+5 and y + 10 = 2x
y=x+5 and 2(y + + 10) = 35
y= x + 5 and 2(y + 10) = x

y= x + 5 and 2(y + 10) = x

Hope this helps! :D

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

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation: