Which expression is equivalent to 2x^2+(4x-6x^2)+9-(6x+3)

-4*(x^2) - 2*x + 6

Step-by-step explanation:

= 2x^2+(4x-6x^2)+9-(6x+3)

= 2*(x^2) + 4*x - 6*(x^2) + 9 - 6*x - 3

= 2*(x^2) - 6*(x^2) + 4*x - 6*x + 9 - 3

= -4*(x^2) - 2*x + 6

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

false

step-by-step explanation:

false : it can not go to 9 the highest that part can go is 7

here is your proof