Znajdz dwie liczby,których suma jest równa 4321,a różnica 1235.
x+y = 4321
x-y = 1235
x = 4321-y
4321-y-y = 1235
-2y= 1235-4321
-2y = -3086 /:(-2)
y= 1543
x = 4321-1543
y=1543
x = 2778
spr.
2778+1543 = 4321
4321= 4321 - poprawne
2778-1543 = 1235
1235=1235 - poprawne
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x+y = 4321
x-y = 1235
x = 4321-y
4321-y-y = 1235
x = 4321-y
-2y= 1235-4321
x = 4321-y
-2y = -3086 /:(-2)
x = 4321-y
y= 1543
x = 4321-1543
y=1543
x = 2778
y= 1543
spr.
2778+1543 = 4321
4321= 4321 - poprawne
2778-1543 = 1235
1235=1235 - poprawne