Identify the domain and range of the following function {(3, 7), (10, 18), (15, 21)}
a) domain: 3, 7, 10 range: 18, 15, 21
b) domain: 3, 10, 15 range: 7, 18, 21
c) domain: 7, 18, 21 range: 3, 10, 15
d) domain: 18, 15, 21 range: 3, 7, 10

Option B) domain: 3, 10, 15 range: 7, 18, 21

Step-by-step explanation:

we have

{(3, 7), (10, 18), (15, 21)}

Remember that

The domain are all possible values of x or input values of the function

The range are all possible values of y or output values of the function

In this problem

the input values are 3,10,15

the output values are 7,18,21

therefore

domain: 3, 10, 15 range: 7, 18, 21

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4