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andrew11 [14]
3 years ago
6

Find the value of two numbersif their sum is 12 and their difference is 4

Mathematics
2 answers:
daser333 [38]3 years ago
7 0
The simple version is this


12-4= 8
Sonbull [250]3 years ago
5 0
We can set up a system of equations:

x + y = 12
x - y = 4

Adding these two together:

2x = 16
x = 8

Substituting 8 in the first equation:

8 + y = 12
y = 4

Hope this helps!
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So, the two things can't can't happen is that you don't have any arrow starting from a point in the domain, i.e. the function is not defined for that element, or that multiple arrows start from the same points.


But as long as an arrow start from each element in the domain, you have a function. It may happen that two different arrow point to the same element in the codomain - that's ok, the relation is still a function, but it's not injective; or it can happen that some points in the codomain aren't pointed by any arrow - you still have a function, except it's not surjective.

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Answer:

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In this case, we'll have to carry out several steps to find the solution.

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