rozwiaz uklady rownan 2metodamia) 2x-2y=7
4x+3y=21d) 1/2x - 2y=8 2x+5y=6i dokonczyc musze x=7-1,5y3*(7-1,5y)-2y=8
2x-2y=7 /*(-2)
4x+3y=21
-4x+4y=-14
7y=7
y=1
2x-2=7
2x=9
x=4,5
2x-2y=7 ⇒x-y=3,5⇒x=3,5+y
4(3,5+y)+3y=21
14+7y=21
d) 1/2x - 2y=8 /*(-4)2x+5y=6
-2x+8y=-32
2x+5y=6
13y=-26
y=-2
2x-10=6
2x=16
x=8
1/2x - 2y=8⇒1/2x=8+2y⇒x=16+4y2x+5y=6
32+8y+5y=6
x=7-1,5y3*(7-1,5y)-2y=8
21-4,5y-2y=8
-6,5y=-13
y=2
x=7-3
x=4
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2x-2y=7 /*(-2)
4x+3y=21
-4x+4y=-14
4x+3y=21
7y=7
y=1
2x-2=7
2x=9
x=4,5
2x-2y=7 ⇒x-y=3,5⇒x=3,5+y
4x+3y=21
4(3,5+y)+3y=21
14+7y=21
7y=7
y=1
2x-2=7
x=4,5
d) 1/2x - 2y=8 /*(-4)
2x+5y=6
-2x+8y=-32
2x+5y=6
13y=-26
y=-2
2x-10=6
2x=16
x=8
1/2x - 2y=8⇒1/2x=8+2y⇒x=16+4y
2x+5y=6
32+8y+5y=6
13y=-26
y=-2
2x-10=6
x=8
x=7-1,5y
3*(7-1,5y)-2y=8
21-4,5y-2y=8
-6,5y=-13
y=2
x=7-3
x=4