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18.06.2020 •
Mathematics
Solve each problem by forming a pair of simultaneous equations: Find two numbers with a sum of 15 and a difference of 4.
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Ответ:
5.5, 9.5
Step-by-step explanation:
Let x and y be the numbers
x+y = 15
x-y = 4
Add the two equations together to eliminate y
x+y = 15
x-y = 4
2x = 19
Divide by 2
2x/2 =19/2
x = 9.5
Now find y
x+y = 15
9.5+y = 15
Subtract 9.5
x = 15-9.5
x =5.5
Ответ:
Step-by-step explanation:
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