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Solving Equations Using Method of Substitution

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Question

Show graphically that the pair of equations $3 x + 4 y = 6, 6 x + 8 y = 12$ represents coincident lines

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Solution

$3 x + 4 y = 6$
$y = \frac{6 - 3 x}{4}$
$a n d$
$6 x + 8 y = 12$
$y = \frac{12 - 6 x}{8}$
The graph shows that the pair of equation represents coincident lines.

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