Question

Me ajudem com o Sistema de Equações?



D){-x-x+y=10 E){-y+2x=20


{2x-3y=-20 {y-10x=-4

Answer 1

d) {–x–x+y=10

{2x–3y=–20

{–2x+y=10

+{2x–3y=–20

–2y=–10×(–1)

$2y = 10 \\ y = \frac{10}{2} \\ y = 5$

2x–3y=–20

2x–3.5=–20

2x–15=–20

2x=15–20

2x=–5

$x = - \frac{5}{2}$

S={-5/2,5}

e) {–y+2x=20

+ {y–10x=–4

–8x=16×(–1)

8x=–16

x=–16/8

x=–2

y=2x–20

y=2.(–2)–20

y=–4–20

y=–24

S={–2,–24}