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⅓x + 2y +1 = 0 |*3
y+x-2=0
x + 6y +3 = 0 |-6y-3
y+x-2=0
x=-6y-3
y-6y-3-2=0
-5y-5=0|+5
-5y=5|:(-5)
y=1-1
x=-6y-3= -6 * (-1) - 3 =6-3=3
b)
2,5x + 0,2y-2,8=0 |*10
x + ⅙y -⅙ = 0 |*6
25x+2y-28=0
6x+y-1=0 | -6x+1
25x+2y-28=0
y= -6x+1
25x+2(-6x+1)-28=0
25x-12x+2-28=0
13x-26=0 | +26
13x=26|:13
x=2
y= -6x+1 = -6*2+1=-12+1=-11
⅓x + 2y +1 = 0
y+x-2=0
⅓x+2y=-1
x+y=2
x=2-y
⅓(2-y)+2y=-1
⅔-⅓y+2y=-1
1⅔y=-1⅔
y=-1
x=2-(-1)
x=3
spr:
⅓x + 2y +1 = 0
⅓*3+2*(-1)+1=0
1-2+1=0
0=0
b)
2,5x + 0,2y-2,8=0
x + ⅙y -⅙ = 0
2,5x+0,2y=2,8
x+⅙y=⅙
x=⅙-⅙y
2,5(⅙-⅙y)+0,2y=2,8
⁵/₁₂-⁵/₁₂y+0,2y=2,8
-¹³/₆₀y=2²³/₆₀
y=-11
x=⅙-⅙*(-11)
x=⅙+1⅚
x=2
spr:
2,5x + 0,2y-2,8=0
2,5*2+0,2*(-11)-2,8=0
5-2,2-2,8=0
0=0