You were billed $17.60 for water usage at a rate of $0.55 per gallon. three choices are correct ways to calculate the the number of gallons, g, of water that you used. which choice is not? a) 17.6 = 0.55 • g b) 17.60/55 = g c) 0.55g = 17.6 d)0.55/g = 17.6

Answer

The incorrect choice for calculate the number of is option (d) .

i.e

Reason

As given

You were billed $17.60 for water usage at a rate of $0.55 per gallon.

The number of gallons of water is represented by g.

Than the equation becomes

0.55 × g = 17.60

g = 32

Therefore 32gallons of water is used .

Thus Option (d) is incorrect between all  the options.

{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

answer: y = -2.5x - 15

              (-6,0)

step-by-step explanation: