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2x+3y=70
x=29-y
2x+3y=70
x=29-y
2(29-y)+3y=70
x=29-y
58-2y+3y=70
x=29-y
y=12
x=29-12
y=12
x=17
y=12
pokoi dwuoso.= 17, a trzyosob.=12
x=pokoje dwuosobowe
y= pokoje trzyosobowe
b - pokoje trzyosobowe
a + b = 29
2a + 3b = 70
a=29-b
2(29-b)+3b = 70
a=29-b
58-2b+3b=70
a=29-b
b=70-58 = 12
a = 29-12 = 17
Pokoi dwuosobowych jest 17, a trzyosobowych 12