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Mathematics

Solve the following simultaneous equations:

x + 2y = 1, 3x - y = 17

Linear Equations

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Answer

Given,

Equations : x + 2y = 1, 3x - y = 17

⇒ x + 2y = 1

⇒ x = 1 - 2y     ….(1)

Substituting value of x from equation (1) in 3x - y = 17, we get :

⇒ 3(1 - 2y) - y = 17

⇒ 3 - 6y - y = 17

⇒ -7y = 17 - 3

⇒ -7y = 14

⇒ y = 147-\dfrac{14}{7} = -2.

Substituting value of y in equation (1), we get :

⇒ x = 1 - 2y

⇒ x = 1 - 2(-2)

⇒ x = 1 + 4

⇒ x = 5.

Hence, x = 5, y = -2.

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