jackiemiranda2010
04.11.2019 •
Mathematics
$the sum of twe numbers is 42. their difference is 16.
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Ответ:
x = 29
y = 13
Step-by-step explanation:
Write 2 equations:
x + y = 42
x - y = 16
Isolate x in the first equation:
x = 42 - y
Substitute this in for x in the second equation:
42 - y - y = 16
42 - 2y = 16
solve for y:
-2y = -26
y = 13
Plug in 13 for y in either equation:
x + 13 = 42
Solve for x:
x = 29
Ответ:
aprox. $66.19
Step-by-step explanation:
100%-11%=8%
74.37 X .89= 66.1893