Rozwiąż układ równań :.... Question from @Mulinka94

September 2018 2 26 Report

Rozwiąż układ równań :

$\left\{ {{3=-3,5a+b\atop{-5=1a+b}}\right$

konioczynka

Odejmujemy stronami

8= -4,5a

-4,5a=8

a= -1 7/9

-5= -1 7/9 + b

b= -5 + 1 7/9

b = -3 2/9

1 7/0 - to jeden i siedem dziewiątych

3 2/9 - to trzy i dwie dziwiąte

1 votes Thanks 0

Roma

$\left \{ {{3 = -3,5a+b \ / \cdot (-1)} \atop {-5 = 1a + b}} \right$

$\left \{ {{-3 = 3,5a-b} \atop {-5 = a + b}} \right$

_____________________

$-8 = 4,5a$

$4\frac{1}{2}a = - 8$

$\frac{9}{2}a = - 8 \ / \cdot \frac{2}{9}$

$a = \frac{-16}{9}$

$a = -1\frac{7}{9}$

$-5 = a + b$

$a + b = - 5$

$-1\frac{7}{9} + b = - 5$

$b = - 5+1\frac{7}{9}$

$b = - 3\frac{2}{9}$

$\left \{ {{a = - 1\frac{7}{9}} \atop {b = - 3\frac{2}{9}}} \right$

1 votes Thanks 0

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