Jakie to liczby?
Ich suma jest równa 90 , a różnica 30.
60, 30
x+y = 90
x-y=30
x=90-y
90-y-y=30
-2y=-60/:-2
y=30
x=90-30
x=60
Sposobem równań ; )
x+y=90
-2y=-60
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60, 30
x+y = 90
x-y=30
x=90-y
90-y-y=30
x=90-y
-2y=-60/:-2
x=90-y
y=30
x=90-30
y=30
x=60
y=30
Sposobem równań ; )
x+y=90
x-y=30
x=90-y
90-y-y=30
x=90-y
-2y=-60
x=60
y=30