Question

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Answer 1

${ - 2x + 3y = 11$

${7x + y = - 4$

$= >$

${ - 2x + 3y = 11$

${y = 4 - 7x$

$= >$

$- 2x + 3(4 - 7x) = 11 = >$

$x = \frac{1}{23}$

$y = 4 - 7 \times \frac{1}{23} = >$

$y = \frac{85}{23}$

$(x.y) = ( \frac{1}{23} . \frac{85}{23} )$

SA FACI O ACOLADĂ MARE IN FAȚA CELOR 2 ECUAȚII PT CĂ E SISTEM

Answer 2

-2x+3y=11 |×7

7x+y=-4 |×2

-14x+21y=77

14x+2y=-8

| 23y=69

Y =69/23

y=3

7x+2×3=-4

7x= -4-6

7x =-10

× =-10/7

am rezolvat prin metoda reducerii