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Simultaneous linear equation in two variables, analytical and graphical solutions. Simultaneous linear in equations. Practical problems on linear equations.

The solution of the system of simultaneous linear equations
4x - 3y = 7 and 7x + 5y = 2 is :

Option:
A. x = 1, y = 1
B. x = -1, y = 1
C. x = -1, y = -1
D. x = 1, y = -1
Answer: D . x = 1, y = -1

Justification:

Multiplying first equation by 5 and second by 3 and adding we get x = 1.
Putting x = 1 in 1st, we get 4 x 1 - 3y = 7 or y = -1

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