icythekit22 icythekit22

21-02-2021
Mathematics

contestada

Please answer this today - First correct answer becomes brainliest

Suppose you know x+2y=-1 and 3y-x=-19. What is xy?

Respuesta :

kayleeharper187 kayleeharper187

22-02-2021

{ x+2y = -1
{ 3y-x = -19

{ x = -1-2y
{ -x = -19-3y

{ x = -1-2y
{ x = 19+3y

-1-2y = 19+3y
y = -4

x = 19+3(-4)
x = 7

(x,y) = (7,-4)

——
check solution
{ 7+2(-4)=-1
{ 3(-4)-7=-19

{ -1 = -1
{ -19 = -19

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