Rozwiąż układ równań:
⅔x+y-7=0 / +7
1⅓x+4y=7/3
⅔x+y=7/ ·-4
-8/3x+-4y=-28
4/3x+4y=7/3
+_____________
1⅓x=-25⅔/ : 1⅓
1⅓x=-25⅔/ ·3/4
x=- 77/4= -19,25
⅔x+y=7/ ·-2
-4/3x+-2y=-14
+______________
2y=-11⅔/ : 2
y= - 23,3(3)
2/3x + y - 7 = 0 /*3
4/3x + 4y = 7/3 /* 3
2x + 3y - 21 = 0
4x + 12y = 7 /:4
2x + 3y = 21
x + 3y = 7/4
x = 7/4 - 3y
2(7/4 - 3y) + 3y = 21
7/2 - 6 y + 3y = 21
-3y = 21 - 3 1/2
-3y = 35/2 /:-3
y = -35/2 * 1/3
y = -35/6
x = 7/4 - 3* -35/6
y = -5 5/6
x = 7/4 + 35/2
x = 7/4 + 70/4
x = 77/4 = 19 1/4
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⅔x+y-7=0 / +7
1⅓x+4y=7/3
⅔x+y=7/ ·-4
1⅓x+4y=7/3
-8/3x+-4y=-28
4/3x+4y=7/3
+_____________
1⅓x=-25⅔/ : 1⅓
1⅓x=-25⅔/ ·3/4
x=- 77/4= -19,25
⅔x+y-7=0 / +7
1⅓x+4y=7/3
⅔x+y=7/ ·-2
1⅓x+4y=7/3
-4/3x+-2y=-14
1⅓x+4y=7/3
+______________
2y=-11⅔/ : 2
y= - 23,3(3)
2/3x + y - 7 = 0 /*3
4/3x + 4y = 7/3 /* 3
2x + 3y - 21 = 0
4x + 12y = 7 /:4
2x + 3y = 21
x + 3y = 7/4
2x + 3y = 21
x = 7/4 - 3y
2(7/4 - 3y) + 3y = 21
x = 7/4 - 3y
7/2 - 6 y + 3y = 21
x = 7/4 - 3y
-3y = 21 - 3 1/2
x = 7/4 - 3y
-3y = 35/2 /:-3
x = 7/4 - 3y
y = -35/2 * 1/3
x = 7/4 - 3y
y = -35/6
x = 7/4 - 3* -35/6
y = -5 5/6
x = 7/4 + 35/2
y = -5 5/6
x = 7/4 + 70/4
y = -5 5/6
x = 77/4 = 19 1/4