Question

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



B) {3x-7y=40
{4x+5y=60

c){x+5y=25
{-2x+y=10

d){4x+2y=20
{x-y=50



e) {7x+5y=52
{5x-3y=40

f) {20x+12y=400
{15x-6y=250


me ajudem por favor

Answer 1

Resposta:

$a)x = 8 \\ y = - 2$

$b)x = \frac{620}{43} \\ y = \frac{20}{43}$

$c)x = - \frac{25}{11} \\y = \frac{60}{11}$

$d)x = 20 \\ y = - 30$

$e)x = \frac{178}{23} \\ y = - \frac{10}{23}$

$f)x = 18 \\ y = \frac{10}{3}$

Espero ter ajudado.