Odpowiedź:
2 x - y = 12 ⇒ y = 2 x - 12
5 y + x = - 15
-----------------------
y = 2 x - 12
5*( 2 x - 12 ) + x = - 15
-------------------------------
10 x - 60 + x = - 15 / + 60
11 x = 45 / : 11
x = [tex]\frac{45}{11}= 4 \frac{1}{11}[/tex]
================
y = 2* [tex]\frac{45}{11} - 12[/tex] = [tex]\frac{90}{11}[/tex] - [tex]\frac{132}{11}[/tex]
y = - [tex]\frac{42}{11} = - 3 \frac{9}{11}[/tex]
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Odpowiedź:
2 x - y = 12 ⇒ y = 2 x - 12
5 y + x = - 15
-----------------------
y = 2 x - 12
5*( 2 x - 12 ) + x = - 15
-------------------------------
10 x - 60 + x = - 15 / + 60
11 x = 45 / : 11
x = [tex]\frac{45}{11}= 4 \frac{1}{11}[/tex]
================
y = 2* [tex]\frac{45}{11} - 12[/tex] = [tex]\frac{90}{11}[/tex] - [tex]\frac{132}{11}[/tex]
y = - [tex]\frac{42}{11} = - 3 \frac{9}{11}[/tex]
================
Szczegółowe wyjaśnienie: