Please Help NO LINKS (1) Suppose you lift a stone that has a mass of 5.9 kilograms off the floor onto a shelf that is 2.5 meters high. How much work have you done?
Joules

(2) Suppose you lift a laptop that weighs 3.4 pounds off the floor onto a shelf that is 2 feet high. How much work have you done?
foot-pounds

(3) The force on a particle is described by
7
x
3
+
2
pounds at a point
x
feet along the
x
-axis. Find the work done in moving the particle from the origin to
x
=
5
.
foot-pounds

{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

b and c are the correct answers.

good luck on the quiz! : d