Answer: D) The relation R is a function because for each input there is exactly one output
There's not much else to say other than what choice D already does. Visually we can use the vertical line test to confirm if we have a function or not. If we can pass a single vertical line through more than one point on a curve, then the curve isn't a function. The graph is said to have failed the vertical line test. Otherwise, the relation passes the vertical line test and we have a function.
Answer:
The correct option is 2.
2) 0 Less-than-or-equal-to x Less-than-or-equal-to 20, –10 Less-than-or-equal-to y Less-than-or-equal-to 20.
Step-by-step explanation:
We have been given 2 equations.
y = -x + 9
y = 0.5x-6
Lets graph the both equations.
From the graph we can see that the line of both equations intersect at point (10,-1)
As the value of x of solution lies in the positive x axis, it is not necessary to graph the value of negative x-axis. It terminates the options 3 and 4 given.
As the value of y of solution lies in negative y-axis, it is necessary to graph some values of negative y-axis. It terminates option 1.
The only option left is option 2
SSS, SAS, ASA, AAS I believe sorry if I’m wrong
Answer:

Step-by-step explanation:
I think what you mean is to solve the expression. Lets do it!

=> 
Therefore,
is our answer
Answer:
-3/19
Step-by-step explanation:
slope = rise/run = (y1 - y2) / (x1 - x2)
s = (19 - 16) / (-9 -10)
s = 3/-19 = -3/19