1) 4*x-6*y=1 → 4*x=1+6*y →x=1/4+6/4*y
2) 3*x+2*y=5
1) in 2)
3*(1/4+6/4*y)+2*y=5
3/4+18/4*y+2*y=5
18/4*y+8/4*y=5-3/4=20/4-3/4=17/4
y*(18/4+8/4)=y*26/4=17/4
y=17/4*4/26
y=17/26
in 1) x=1/4+6/4*17/26=1/4+102/104=1/4+51/52=13/52+51/52=64/52=16/13
x=1 3/13
aus 1) y1=f1(x)=2/3*x-1/6
aus 2) y2=f2(x)=-3/2*x+5/2
~plot~2/3*x-1/6;-3/2*x+5/2;[[-5|5|-5|5]];x=16/13~plot~