1a
3½x-2⅖y=1,1/*10
½y+6=0,4x/*10
35x-24y=11
5y+60=4x
35x-24y=11
5y=4x-60/5
35x-24y=11
y=⅘x-12
35x-24*(⅘x-12)=11
y=⅘x-12
35x-19⅕=11-288
y=⅘x-12
15⅘x=-277/15⅘
y=⅘x-12
x≈17,53
y=⅘*17,53-12
x=17,53
y=2,024
1b
5x=6y-6
3x+5y=3
5x-6y=-6/*(-3)
3x+5y=3/*5
-15x+18y=18
15x+25y=15
43y=33/43
y=33/44
5x-6y=-6/*5
3x+5y=3/*6
25x-30y=-30
18x+30y=18
43x=-12/43
x=-12/43
2.
3,
2⅖x-1⅓y=6/*15
2¾x+3=1½y-3/*4
51x-20y=90/*11
11x-6y=-24/*(-51)
561x-220y=990
-561x+306y=1224
86y=2214/86y=25 32/43
51x-20y=90/*6
11x-6y=-24/*(-20)
306x-120y=540
-220x+120y=480
86x=1020/86
x=11 37/510