How do you use the elemination method to solve x+y=9 , x-y=7

add the 2 equations together

x+y =9

x-y =7

2x = 16

divide by 2

x=8

x+y =9

substitute in x=8

8+y =9

subtract 8 from each side

y =1

(8,1)

they are simplified

step-by-step explanation:

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: