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2x-y=2
y+1=3x
-y=2-2x /:(-1)
y+1=3x
y=-2+2x
y+1=3x
y=-2+2x
-2+2x+1=3x
y=-2+2x
2x-3x=-1+2
y=-2+2x
-x=1 /:(-1)
y=-2+2x
x=-1
y=-2+2*(-1)
x=-1
y=-2-2
x=-1
y=-4
x=-1
b)
3x+y=6
x-y=4
y=6-3x
x-y=4
y=6-3x
x-(6-3x)=4
y=6-3x
x-6+3x=4
y=6-3x
x+3x=4+6
y=6-3x
4x=10 /:4
y=6-3x
x=2,5
y=6-3*2,5
x=2,5
y=6-7,5
x=2,5
y=-1,5
x=2,5
/ 2x - y = 2 => 2 * (-1) - y = 2 | +y
\ y + 1 = 3x | - 1 - 2 = 2 + y | -2
-4 = y
/ 2x - y = 2
\ y = 3x - 1
2x - ( 3x - 1 ) = 2
2x - 3x + 1 = 2 | - 1
- x = 1 | * (-1)
x = -1
b)
/ 3x + y = 6 => 3x - 1,5 = 6 | + 1,5
\ x - y = 4 | +y 3x = 7,5 | : 3
x = 2,5
/ 3x + y = 6
\ x = 4 + y
3 ( 4 + y ) +y = 6
12 + 3y + y = 6 | - 12
4y = - 6 | : 4
y = - 1,5
Pozdrawiam! ;D