rozwiąż układy równań:
a) 2x-5y= -19
-5x+3y= 19 odpowiedz: x= -2, y= 3
b) 3x+2y=9
-4x+3y= -29 odpowiedz: x= 5, y= -3
c) 1/3x + 1/4y = 23/12
2/3x -3/2y = 37/6 odpowiedz: x= 2, y= 5
d) 16x-27y= 20
5x+18y= 41,5 odpowiedzi: x= 3 całe i 1/2 y= 1 cała i 1/3
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a)
2x - 5y = -19 |*5
-5x + 3y = 19 |*2
10x - 25y = -95
-10x + 6y = 38
-19y = -57
y = -57/-19 = 3
2x - 5*3 = -19
2x = 15 - 19
2x = -4
x = -2
b)
3x + 2y = 9 |*3
-4x + 3y = -29 |*(-2)
9x + 6y = 27
8x - 6y = 58
17x = 85
x = 85/17 = 5
3*5 + 2y = 9
2y = 9 - 15
2y = -6
y = -3
d)
16x - 27y = 20 |*5
5x + 18y = 41,5 |*-16
80x - 135y = 100
-80x - 288y = -664
-423y = -564
y = 564/423 = 4/3
5x + 18*4/3 = 41,5
5x = 41,5 - 24
5x = 17,5
x = 7/2