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a+3r=8
5a+r+2r+3r+4r=20
a+3r=8
5a+10r=20 /:(-5)
a+3r=8
-a-2r=-4
----------- +
r=4
a+12=8
Odp. a1=-4, r=4.
b)
5a+10r=35 /:(-5)
7a+21r=70 /:7
-a-2r=-7
a+3r=10
-----------
r=3
a+3*3=10
a=1
Odp. a1=1, r=3.