Answer:
In mathematics, a function is a binary relation over two sets that associates to every element of the first set exactly one element of the second set. Typical examples are functions from integers to integers or from the real numbers to real numbers.
Step-by-step explanation:
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Answer: 180
Step-by-step explanation:
X would be 0 while Y would be 4
3x+y=4
-(2x+y=4)
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x=0
Plug in x to any of those two equations in their original form
3(0)+y=4
0 + y = 4
y = 4