Find the piont on the graph of 3x-4y=9 where the y - coordinate is 3 times the x-coordinate

Question

Mathematics

Nicolas Anderson

17 December, 08:13

Find the piont on the graph of 3x-4y=9 where the y - coordinate is 3 times the x-coordinate

+3

Answers (1)

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Brooklynn Blevins · Answer 1

y-coordinate is 3 times the x-coordinate → y = 3x

Substitute to the equation 3x - 4y = 9:

3x - 4 (3x) = 9

3x - 12x = 9

-9x = 9 divide both sides by (-9)

x = - 1

y = 3 (-1)

y = - 3

Answer: (-1, - 3).