Question

This table represents a relationship between x and y, where x is the independent variable.

x 20 40 60 80 100
y 10 30 50 70 90
Which equation represents the relationship between x and y?


y = 2x

y = x + 10

y=12x

y=x−10

Answer 1

The last one.

y = x - 10

Let’s check our answer using (20,10) and (100,90)

y = x - 10
10 = 20 -10
10 = 10
This statement is correct.

y = x - 10
90 = 100 - 10
90 = 90
This statement is correct.

Our final answer is: y = x - 10

Hope that helps!