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3x+4y+2=0
15x+23y= -10
3x+4y= -2 */(-5)
15x+23y= -10
-15x-20y= 10
3y=0 /:3
y=0
15x+23y= -10
y=0
15x+23*0=-10
y=0
15x+0=-10
y=0
15x= -10 /:(15)
y=0
x= -10/15
y=0
•••••••••••••••••
18x-21y=3
24x-15y=7 /*(-1,4)
18x-21y=3
-33,6x+21y= -9,8
-15,6x= -6,8 /:(-15,6)
x=0,44
18x-21y=3
x=0,44
18*0,44-21y=3
x=0,44
7,92-21y=3
x=0,44
-21y=3-7,92
x=0,44
-21y=-4,92 /:(-21)
x=0,44
y=0,24
x=0,44
3x+4y+2=0 /*(-15)
45x+69y+30=0
+ -45x-60y-30=0
____________________
9y=0 /:9
y=0
y=0
15x+23*0+10=0
y=0
15x=-10 / : 15
y=0
x= - 10/15 - w ułamku dziesięć piętnastych
Sprawdzenie:
15*-10/15+23*0+10= - 10 +0+10= 0
Z drugim mi coś nie wyszło ...
3x+4y+2=0 | *(-5)
15x+23y+10=0
-15x-20y-10=0
3y=0
y=0
y=0
3x+4y+2=0
y=0
3x+2=0
x=-2/3
y=0
18x-21y=3 | :3
24x-15y=7
6x-7y=1 | *(-4)
24x-15y=7
-24x+28y=-4
24x-15y=7
13y=3 | :13
y=3/13
y=3/13
6x-7y=1
y=3/13
6x-21/13=1
y=3/13
6x=2 8/13
y=3/13
x=34/13 * 1/6
y=3/13
x=34/78
y=3/13
x=17/39