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3b+4z=17zł
5b+2z=19zł/*(-2)
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3b+4z=17zł
-10b-4z=-38zł
-7b=17-38
-7b=-21/:(-7)
b=3
3*3zł +4z=17
4z=17-9
z=2
legenda;
z-zeszyt
b-blok
y-cena zeszytów
oczywiscie w klamrze
[ 3x+4y=17
5x+2y=19
3x=17-4y //:3
x=17/3 - 4/3y
5(17/3 - 4/3y)+2y=19
85/3-20/3y+6/3y=19
-14/3y=19-85/3
-14/3y=57/3 -85/3
-14/3y=-28/3 //:(-14/3)
y=-28/3*(-3/14)
y=2
x=17/3-4/3*2
x=17/3-8/3
x=9/3
x=3