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Mathematics

On comparing the ratios a1a2,b1b2,c1c2\dfrac{a1}{a2}, \dfrac{b1}{b2}, \dfrac{c1}{c2} find out whether the following pair of linear equations are consistent, or inconsistent.

43x+2y=8;2x+3y=12\dfrac{4}{3}x + 2y = 8; 2x + 3y = 12

Linear Equations

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Answer

Given,

Equations : 43x+2y=8;2x+3y=12\dfrac{4}{3}x + 2y = 8; 2x + 3y = 12 or,

⇒ 4x + 6y = 24; 2x + 3y = 12

⇒ 4x + 6y - 24 = 0 ; 2x + 3y - 12 = 0.

Comparing equations 4x + 6y - 24 = 0 and 2x + 3y - 12 = 0 with a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 respectively, we get :

a1 = 4, b1 = 6, c1 = -24, a2 = 2, b2 = 3 and c2 = -12.

a1a2=42=2\dfrac{a1}{a2} = \dfrac{4}{2} = 2

b1b2=63=2\dfrac{b1}{b2} = \dfrac{6}{3} = 2

c1c2=2412=2\dfrac{c1}{c2} = \dfrac{-24}{-12} = 2

Since, a1a2=b1b2=c1c2\dfrac{a1}{a2} = \dfrac{b1}{b2} = \dfrac{c1}{c2}.

Hence, the set of linear equations are consistent.

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