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Solve the system below. Then find −2xy.

x=−11−4y

2x−3y=11

Sagot :

Answer:

- 2xy = 6

Step-by-step explanation:

x = - 11 - 4y → (1)

2x - 3y = 11 → (2)

Substitute x = - 11 - 4y into (2)

2(- 11 - 4y) - 3y = 11 ← distribute parenthesis and simplify left side

- 22 - 8y - 3y = 11

- 22 - 11y = 11 ( add 22 to both sides )

- 11y = 33 ( divide both sides by - 11 )

y = - 3

Substitute y = - 3 into (1)

x = - 11 - 4(- 3) = - 11 + 12 = 1

solution is (1, - 3 )

Then

- 2xy = - 2 × 1 × - 3 = 6

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