Question

Given the coordinate plane below, what is the domain and range of Figure b?

Remember that the domain is the x-values and the range is the y-values of the graph

Answer 1

Domain = { 7 ≤ x ≤ 9 }

Range = { 2 ≤ y ≤ 11 }

Explanation:

Figure b is the line.

Remember, domain is the set of x values for which the function is defined.

and range is the set of y values for which the function is defined.

When given a graph, to find domain, we look at from which x value to which other x value is the function defined for. Looking at the graph, wee see that the function goes from x = 7 to x = 9 (7 and 9 are included, signified by closed dots).

Now, for range, we see that the graph goes from y = 2 to y = 11 (2 and 11 are included signified by closed dots at endpoints).

So, we can say:

Domain = { 7 ≤ x ≤ 9 }

Range = { 2 ≤ y ≤ 11 }