Question

Rozwiąż układ równań
3(x-2y ) + 2(x+y) =4
5(x-y ) - 3( 2x + y ) = -3

Answer 1

3x - 6y + 2x + 2y = 4
5x - 5y -6x -3y = -3

5x - 4y = 4
-x - 8y = -3

5x - 4y = 4
-x = -3 + 8y    /*-1

5x - 4y = 4
x = 3 - 8y
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5*(3 - 8y) - 4y = 4
15 - 40y - 4y = 4
-44y = -11    /:-44
y = 1/4

x = 3 - 8*1/4
x = 3 - 8/4
x = 3 - 2
x = 1

x=1
y=1/4