Odpowiedź:
[tex]\left\{ \begin{array}{l} x + y =33 \\ 30\%x + 20\%y = 9 \end{array}[/tex]
[tex]\left\{ \begin{array}{l} x + y = 33 \\ 0,3x + 0,2y = 9 \end{array}[/tex]
x + y = 33
x = 33 - y
0,3x + 0,2y = 9
0,3 * (33 - y) + 0,2y = 9
9,9 - 0,3y + 0,2y = 9
-0,1y = - 0,9
y = 9
x = 33 - 9
x = 24
[tex]\left\{ \begin{array}{l} x = 24 \\ y = 9 \end{array}[/tex]
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Odpowiedź:
[tex]\left\{ \begin{array}{l} x + y =33 \\ 30\%x + 20\%y = 9 \end{array}[/tex]
[tex]\left\{ \begin{array}{l} x + y = 33 \\ 0,3x + 0,2y = 9 \end{array}[/tex]
x + y = 33
x = 33 - y
0,3x + 0,2y = 9
0,3 * (33 - y) + 0,2y = 9
9,9 - 0,3y + 0,2y = 9
-0,1y = - 0,9
y = 9
x = 33 - y
x = 33 - 9
x = 24
[tex]\left\{ \begin{array}{l} x = 24 \\ y = 9 \end{array}[/tex]