a)
2x+y=14
8x+0,5y=35
0,5y=35-8x
y=70-16x
2x+70-16x=14
70-14x=14
-14x=-56
x=4
y=14-2·4
y=6
------------------------------
8x+0,5y=35 /·(-2)
-16x-y=-70
__________ +
8·4+0,5y=35
32+0,5y=35
0,5y=3
b)
3x+4y=2
5x+7y=1
5x=1-7y
3x=3/5-4,2y
3/5-4,2y+4y=2
-0,2y=7/5
y=-7
3x=2-4*(-7)
3x=30
x=10
3x+4y=2 /·(-5)
5x+7y=1 /·3
-15x-20y=-10
15x+21y=3
____________+
3x+4·(-7)=2
3x-28=2
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a)
2x+y=14
8x+0,5y=35
0,5y=35-8x
y=70-16x
2x+70-16x=14
70-14x=14
-14x=-56
x=4
y=14-2·4
y=6
------------------------------
2x+y=14
8x+0,5y=35 /·(-2)
2x+y=14
-16x-y=-70
__________ +
-14x=-56
x=4
8·4+0,5y=35
32+0,5y=35
0,5y=3
y=6
x=4
y=6
b)
3x+4y=2
5x+7y=1
5x=1-7y
3x=3/5-4,2y
3/5-4,2y+4y=2
-0,2y=7/5
y=-7
3x=2-4*(-7)
3x=30
x=10
------------------------------
3x+4y=2 /·(-5)
5x+7y=1 /·3
-15x-20y=-10
15x+21y=3
____________+
y=-7
3x+4·(-7)=2
3x-28=2
3x=30
x=10
x=10
y=-7