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Solve the following simultaneous equation for x. x2

Solve the following simultaneous equation for x. x2 + y - 5 = 0, y - 7x + 3 = 0

A.

-2, 4

B.

2, 4

C.

-1,8

D.

1, -8

View answer & explanation

Correct answer is D

x2 + y - 5 = 0.....(i)

y - 7x + 3 = 0.........(ii)

y = 7x - 3, substituting the value of y in equation (i)

x2 + (7x - 3) - 5 = 0

x2 + 7x + 3 = 0

(x + 8)(x - 1) = 0

x = -8 or 1

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