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Mathematics

For each equation, given below, find the slope and the y-intercept :

(i) 3x + 2y + 4 = 0

(ii) x - 3y - 8 = 0

(iii) x + y + 4 = 0

(iv) x = 3y + 2

(v) y = 5 - 4x

(vi) 2y + 5 = 0

Coordinate Geometry

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Answer

(i) 3x + 2y + 4 = 0

⇒ 2y = - 3x - 4

⇒ y = 3x42\dfrac{- 3x - 4}{2}

⇒ y = 3x242\dfrac{- 3x}{2} - \dfrac{4}{2}

⇒ y = 32 x 2\dfrac{- 3}{2} \text{ x } -2

∴ Slope = coefficient of x = 32\dfrac{-3}{2}

And, y-intercept = constant term = -2

Hence, slope = 32\dfrac{- 3}{2} and y-intercept = -2.

(ii) x - 3y - 8 = 0

⇒ 3y = x - 8

⇒ y = x83\dfrac{x - 8}{3}

⇒ y = 13 x 83\dfrac{1}{3} \text{ x } - \dfrac{8}{3}

∴ Slope = coefficient of x = 13\dfrac{1}{3}

And, y-intercept = constant term = 83\dfrac{-8}{3}

Hence, slope = 13\dfrac{1}{3} and y-intercept = 83\dfrac{-8}{3}.

(iii) x + y + 4 = 0

⇒ y = -x - 4

∴ Slope = coefficient of x = -1

And, y-intercept = constant term = -4

Hence, slope = -1 and y-intercept = -4.

(iv) x = 3y + 2

⇒ 3y = x - 2

⇒ y = x23\dfrac{x - 2}{3}

⇒ y = 13 x 23\dfrac{1}{3} \text{ x } - \dfrac{2}{3}

∴ Slope = coefficient of x = 13\dfrac{1}{3}

And, y-intercept = constant term = 23\dfrac{-2}{3}

Hence, slope = 13\dfrac{1}{3} and y-intercept = 23\dfrac{-2}{3}.

(v) y = 5 - 4x

⇒ y = -4x + 5

∴ Slope = coefficient of x = -4

And, y-intercept = constant term = 5

Hence, slope = -4 and y-intercept = 5.

(vi) 2y + 5 = 0

⇒ 2y = -5

⇒ y = 52\dfrac{-5}{2}

⇒ y = 0 + 52\dfrac{-5}{2}

∴ Slope = coefficient of x = 0

And, y-intercept = constant term = 52\dfrac{-5}{2}

Hence, slope = 0 and y-intercept = 52\dfrac{-5}{2}.

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