zad 1 rozwiaz uklady rownan
a)
b)
4x + 5y = -7
-2x - 3y = 3 /*2
-4x - 6y = 6
-----------------------
4x - 4x + 5y - 6y = -7 + 6
-y = -1
y = 1
4x + 5 * 1 = -7
4x = -7 - 5
4x = -12 /:4
x = -3
2x + y - 4 = 3x - 3y
4x + 4y = 7x + y - 6
2x - 3x + 3y + y = 4
4x - 7x + 4y - y = -6
-x + 4y = 4
-3x + 3y = -6 /:(-3)
x - y = 2
--------------------
-x + x + 4y - y = 4 + 2
3y = 5 /:3
y = 5/3
-x + 4 * 5/3 = 4
-x + 20/3 = 4
-x = 12/3 - 20/3
-x = -8/3
x = 8/3
A drugiego nie umiem :/ Sorki
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4x + 5y = -7
-2x - 3y = 3 /*2
4x + 5y = -7
-4x - 6y = 6
-----------------------
4x - 4x + 5y - 6y = -7 + 6
-y = -1
y = 1
4x + 5 * 1 = -7
4x = -7 - 5
4x = -12 /:4
x = -3
b)
2x + y - 4 = 3x - 3y
4x + 4y = 7x + y - 6
2x - 3x + 3y + y = 4
4x - 7x + 4y - y = -6
-x + 4y = 4
-3x + 3y = -6 /:(-3)
-x + 4y = 4
x - y = 2
--------------------
-x + x + 4y - y = 4 + 2
3y = 5 /:3
y = 5/3
-x + 4y = 4
-x + 4 * 5/3 = 4
-x + 20/3 = 4
-x = 12/3 - 20/3
-x = -8/3
x = 8/3
a)
A drugiego nie umiem :/ Sorki