Question

3x+2y=40 x-4y=-10 comparação

Answer 1

3x+2y=40x-4y=-10

$\left \{ {{3x+2y=-10} \atop {40x-4y=-10}} \right.$

$\left \{ {{3x+2y=-10} \atop {20x-2y=-5}} \right.$

23x=-5

x=-$\frac{15}{23}$

3.(-$\frac{15}{23}$)+2y=-10

y=-$\frac{185}{46}$

(x,y)=$(-\frac{15}{23},[tex] 3.(-\frac{15}{23}) +2.(-\frac{185}{46}.)=40.(-\frac{15}{23})-4.(-\frac{185}{46})=-10$-$</p><p>-10=-10=-10</p><p>(x,y)=[tex] (-\frac{15}{23},-\frac{185}{46}$)

ignore os "Â"