Rozwiąż układy równań metodą podstawiania.
a) 2x+y=2
3x-2y=3
b) x+3y=3
2x+5y=5
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a) 2x+y=2
3x-2y=3
y = 2 - 2x
3x -2(2 - 2x) = 3
y = 2 - 2x
3x - 4 + 4x = 3
y = 2 - 2x
7x = 7
y = 2 - 2x
x = 1
y = 2 - 2
x = 1
y = 1
x = 1
b) x+3y=3
2x+5y=5
x = 3 - 3y
2(3 - 3y) + 5y = 5
x = 3 - 3y
6 - 6y + 5y = 5
x = 3 - 3y
-y = 5 - 6
x = 3 - 3y
-y = -1
x = 3 - 3y
y = 1
x = 3 - 3
y = 1
x = 0
y = 1