Question

3x+2y=0 and 2x+y=-1 solve by substitution method​

Answer 1

2x+y=-1, y=-1-2x

3x+2y=0

3x+2(-1-2x)=0

3x+(-2-4x)=0

-x=2

x=-2

returning to the first equation

2(-2)+y=-1

y=4-1=3

(-2;3)

Answer 2

Explicação passo-a-passo:

System equation:

Substitution method:

{ 3x + 2y = 0

{ 2x + y = -1

{ y = -1 - 2x

{ 3x + 2(-1-2x) = 0

{ -----------

{ 3x - 2 - 4x = 0

{ ------------

{-x = 2

{ --------------

{ x = -2

y = -1 - 2 • (-2)

y = -1 + 4

y = 3

Sol: { -2 ; 3 }