Solve the equations using elimination method:
$x - 4 y = - 20$ and $4 x + 4 y = 20$

(0, 5)

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(-1, 5)

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(0, -5)

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(-5, 0)

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Solution

The correct option is D (0, 5)
Subtract the equation (1) and (2)
$x - 4 y = - 20$ ----- (1)
$4 x + 4 y = 20$ ----- (2)
___________
$5 x = 0$
$x = \frac{0}{5} = 0$
Put the value of x in equation (1), we get
$x - 4 y = - 20$
$0 - 4 y = - 20$
$y = \frac{- 20}{- 4}$
$y = 5$
Therefore the solution is (0, 5)

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