Rozwiąż to równanie sposobem podstawiania.
3x+2y=19
5x-y=10
3x + 2y = 19
5x - 10 = y
3x + 2(5x - 10) = 19
y = 5x -10
3x + 10x - 20 = 19
y = 5x - 10
13x = 19 + 20
13x = 39 / : 13
x = 3
y = 5*3 -10
y = 15 - 10
y = 5
5x-y=10 /*2
10x-2y=20
_________
13x= 39/:13
x=3
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3x + 2y = 19
5x - 10 = y
3x + 2(5x - 10) = 19
y = 5x -10
3x + 10x - 20 = 19
y = 5x - 10
13x = 19 + 20
y = 5x -10
13x = 39 / : 13
y = 5x -10
x = 3
y = 5*3 -10
x = 3
y = 15 - 10
x = 3
y = 5
3x+2y=19
5x-y=10 /*2
3x+2y=19
10x-2y=20
_________
13x= 39/:13
x=3