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wshemekia3oyliv4
10.10.2019 •
Mathematics
The sum of two numbers is 43 and the difference is 19. what are the numbers?
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Ответ:
x + y = 43 and x - y = 19
You can re-arrange one of the equations to get
x = 43 - y Then substitute this into the other equation, so instead of x you put this:
(43 - y) - y = 19
43 - 2y = 19
-2y = 19 - 43
-2y = -24
-y = -12
so y = 12
then you can do 43 - 12 = 31 to get both of the numbers.
so the numbers are 31 and 12
Ответ:
27
hope this helps