Answered

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The ordered pair (x,y) satisfies the
system of equations
2y – x= -7
x + 2y = 3
What is the value of 4y?

Sagot :

devishri1977

Answer:

Step-by-step explanation:

2y - x = - 7  ------------(I)

   ⇒ 2y = -7 + x ---------(II)

x + 2y = 3 ------------(III)

Substitute 2y = -7 + x in equation (III)

x + (-7 + x ) = 3

x - 7 +x = 3

  2x - 7 = 3

        2x = 3 + 7

        2x = 10

Divide both sides by 2

        x = 10/2

x = 5

Substitute x =5 in equation (I)

         

2y - 5  = -7

   2y = -7 + 5

    2y = -2

Divide both sides by 2

       y = -2/2

       y = -1

4y = 4*(-1) = -4

4y = -4

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