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Mathematics

Solve the following system of equations by using the method of cross multiplication:

2x + 3y = 17, 3x − 2y = 6

Linear Equations

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Answer

Given,

Equations:

⇒ 2x + 3y - 17 = 0

⇒ 3x - 2y - 6 = 0

By cross-multiplication method,

Solve the following system of equations by using the method of cross multiplication: R.S. Aggarwal Mathematics Solutions ICSE Class 9.

x(3)×(6)(2)×(17)=y(17)×(3)(6)×(2)=1(2)×(2)(3)×(3)x(18)34=y51+12=149x52=y39=113x52=113 and y39=113x=5213 and y=3913x=4 and y=3.\Rightarrow \dfrac{x}{(3) \times (-6) - (-2) \times (-17)} = \dfrac{y}{(-17) \times (3) - (-6) \times (2)} = \dfrac{1}{(2) \times (-2) - (3) \times (3)} \\[1em] \Rightarrow \dfrac{x}{(-18) - 34} = \dfrac{y}{-51 + 12} = \dfrac{1}{-4 - 9} \\[1em] \Rightarrow \dfrac{x}{-52} = \dfrac{y}{-39} = \dfrac{1}{-13} \\[1em] \Rightarrow \dfrac{x}{-52} = \dfrac{1}{-13} \text{ and } \dfrac{y}{-39} = \dfrac{1}{-13} \\[1em] \Rightarrow x = \dfrac{-52}{-13} \text{ and } y = \dfrac{-39}{-13} \\[1em] \Rightarrow x = 4 \text{ and } y = 3.

Hence, x = 4 and y = 3.

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