a) 2x-2y=7
3y+1=4x
b) x+2y=-2
2x-y=1
1.
2x-2y = 7
3y+1 = 4x
2x-2y = 7 I*2
-4x+3y = -1
4x-4y = 14
----------------- +
-y = 13
y = -13
=====
2x = 7+2y = 7+2*(-13) = 7-26 = -19
2x = -19 /:2
x = -9,5
{x = -9,5}
{y = -13}
2.
x+2y = -2
2x-y = 1 I*2
4x-2y = 2
------------- +
5x = 0
x = 0
====
2y = -2-x
2y = -2 /:2
y = -1
{x = 0}
{y = -1}
a)
2x-2y=7
2x - 2y = 7 /*2
-4x + 3y = -1
4x - 4y = 14
---------------- +
-y = 13 /:(-1)
2x - 2y = 7
2x - 2 * (-13) = 7
2x + 26 = 7
2x = 7 - 26
2x = - 19 /:2
x = - 9,5
b)
x+2y=-2 /*(-2)
-2x - 4y = 4
2x - y = 1
--------------- +
-5y = 5 /:(-5)
2x - (-1) = 1
2x + 1 = 1
2x = 0
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1.
2x-2y = 7
3y+1 = 4x
2x-2y = 7 I*2
-4x+3y = -1
4x-4y = 14
-4x+3y = -1
----------------- +
-y = 13
y = -13
=====
2x = 7+2y = 7+2*(-13) = 7-26 = -19
2x = -19 /:2
x = -9,5
=====
{x = -9,5}
{y = -13}
2.
x+2y = -2
2x-y = 1 I*2
x+2y = -2
4x-2y = 2
------------- +
5x = 0
x = 0
====
2y = -2-x
2y = -2 /:2
y = -1
====
{x = 0}
{y = -1}
a)
2x-2y=7
3y+1=4x
2x - 2y = 7 /*2
-4x + 3y = -1
4x - 4y = 14
-4x + 3y = -1
---------------- +
-y = 13 /:(-1)
y = -13
2x - 2y = 7
y = -13
2x - 2 * (-13) = 7
y = -13
2x + 26 = 7
y = -13
2x = 7 - 26
y = -13
2x = - 19 /:2
y = -13
x = - 9,5
b)
x+2y=-2 /*(-2)
2x-y=1
-2x - 4y = 4
2x - y = 1
--------------- +
-5y = 5 /:(-5)
y = -1
2x - y = 1
y = -1
2x - (-1) = 1
y = -1
2x + 1 = 1
y = -1
2x = 0
y = -1
x = 0