Răspuns:
Explicație pas cu pas:
a)
x/y = 1/4
x/y = 2/8 = 1/4
x/y = 2,5/10 = 1/4
x/y = 6/24 = 1/4
x/y = 8/32 = 1/4
sunt direct proportionale
b)
x/y = 3/9 = 1/3
x/y = 4/12 = 1/3
x/y = 6/15 = 2/5
x/y = 8/30 = 4/15
x/y = 10/20 = 1/2
nu sunt direct proportionale
c)
x/y = 5/210 = 1/42
x/y = 10/420 = 1/42
x/y = 8/336 = 1/42
x/y = 3/126 = 1/42
x/y = 15/630 = 42
sunt direct proportionale
