lucygperez7946
18.08.2021 •
Mathematics
The table shows the total number of posts made by the average registered user of a new social media app in the first week after purchasing the app. Type the correct answer in each box. Use numerals instead of words. Round your answers to the nearest tenth.
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Ответ:
7 and 11
Step-by-step explanation:
Let the two numbers be x and y
x+y = 18
x-y = 4
Add the two equations together to eliminate y
x+y = 18
x-y = 4
2x +0y = 22
Divide each side by 2
2x/2 = 22/2
x = 11
Solve for y
x+y = 18
11+y =18
Subtract 11 from each side
11+y-11 =18-11
y = 7
The two numbers are 7 and 11