In which set of points is y a function of x? A. {(1, 4), (2, 7), (1, 10), (3, 13)}
B. {(0, 0), (1, 1), (2, 2), (2, -2)}
C. {(0, -6), (1, -8), (2, -10), (3,-6)}
D. {(10, 20), (20, 40), (20, 80), (40, 80)}

the first option is the answer.

96 39 cause 135 -96=39 im smart (i used a calculater)

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !