7. Is the following a function? {(1,3), (2,4), (3,5),(4,10), (5,15),(3,5)}

Yes it's a function.

Explanation:

While x = 3 does repeat itself, the y value repeats itself as well for this particular x value. In other words, we have two copies of (3,5). Toss out any duplicate (x,y) pairings and we have this simplified set:

{(1,3), (2,4), (3,5), (4,10), (5,15)}

At this point, we don't have any repeated x values. Therefore, we have a function. Any input x leads to exactly one y output. The y values are allowed to repeat themselves.

Extra info:

No

Step-by-step explanation:

If you look at the numbers in each pair, three is the first number (x) in 2 of them. Functions cannot have repeating Xs.

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

6 cm

step-by-step explanation: