Rozwiaż uklady rownań:
1. -3x+4y=7
2x-3y=-6
2.x+4y=6
2x-6y=8
3. x+y=200
0,7x=1,3y-20
1.
--------------------------
0-y=-4 /*-1
y=4
2x-3*4=-6
2x-12=-6
2x=6
x=3
2.
_____________________________
0-14y=-4
14y=4
y=
x+4*=6
x+=6
x=
Zadnie 3.
x=200-y
0,7(200-y)-1,3y=-20
140-0,7y-1,3y=-20
-2y=-160
2y=160
y=80
x+80=200
x=120
-3x+4y=7 / * 2
2x-3y=-6 ---- / * 3
-6x + 8y = 14
6x - 9y = -18
-----------------
-y = -4
y = 4
2x - 3 * 4 = -6
2x - 12 = -6
2x = -6 + 12
2x = 6
x = 3
y = 42.
x + 4y = 6 ----- / *(-2)2x -6y = 8
-2x - 8y = -12
2x - 6y = 8
--------------
-14y = -4
y = 4/14
y = 2/7
x + 4 * 2/7 = 6
x + 8/7 = 6
x = 42/7 - 8/7
x = 34/7
x = 4 i 6/7
3.
x + y = 200
0,7x = 1,3y - 20
x + y = 200 ---------- / * (-0,7)
0,7x - 1,3y = -20
-0,7x - 0,7y = -140
------------------
-2y = -160
y = 80
x + 80 = 200
x = 200 - 80
x = 120
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1.
--------------------------
0-y=-4 /*-1
y=4
2x-3*4=-6
2x-12=-6
2x=6
x=3
2.
_____________________________
0-14y=-4
14y=4
y=
x+4*=6
x+=6
x=
x=
Zadnie 3.
x=200-y
0,7(200-y)-1,3y=-20
140-0,7y-1,3y=-20
-2y=-160
2y=160
y=80
x+80=200
x=120
1.
-3x+4y=7 / * 2
2x-3y=-6 ---- / * 3
-6x + 8y = 14
6x - 9y = -18
-----------------
-y = -4
y = 4
2x - 3 * 4 = -6
2x - 12 = -6
2x = -6 + 12
2x = 6
x = 3
x = 3
y = 4
2.
x + 4y = 6 ----- / *(-2)
2x -6y = 8
-2x - 8y = -12
2x - 6y = 8
--------------
-14y = -4
y = 4/14
y = 2/7
x + 4 * 2/7 = 6
x + 8/7 = 6
x = 42/7 - 8/7
x = 34/7
x = 4 i 6/7
x = 4 i 6/7
y = 2/7
3.
x + y = 200
0,7x = 1,3y - 20
x + y = 200 ---------- / * (-0,7)
0,7x - 1,3y = -20
-0,7x - 0,7y = -140
0,7x - 1,3y = -20
------------------
-2y = -160
y = 80
x + 80 = 200
x = 200 - 80
x = 120
x = 120
y = 80