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Values of a and b so that system of equa...

Values of a and b so that system of equations `2x + 3y = 7 and 2 ax + (a +b) y = 28` has infinitely many solutons are

A

`a = 4, b = 8`

B

`a = 8, b = 4`

C

`a =- 4, b =- 8`

D

`a =- 8, b =- 4`

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The correct Answer is:
A
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LUCENT PUBLICATION-GRAPHICAL SOLUTION OF LINEAR EQUATION -EXERCISE-3A
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  2. Area of quadrilateral formed by straight lines 2x =- 5 , 2y = 3 , x=1...

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  3. Area of triangle formed by straight lines 3x + 4y = 24, x = 8 and y =1

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  4. Area of quadrilateral formed by striahgt lines x =1, x = 3, y =2 and ...

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  5. Area of triangle formed by straight lines x = 0, x + 2y = 0 and y = 1

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  6. Area of triangle formed by straight lines x - y = 0, x + y = 0 and 2 x...

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  7. Area enclosed by equation y = |x| - 5 with x-axis is

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  8. Area enclosed by the equation |x| + |y|= 4 is

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  9. Area enclosed by equation y = |x| -1 and y =1 - |x| is

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  10. Which of the following system of equations has unique solutions

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  11. Which of the following system of equation has infinitely many solution...

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  12. Which of the following sytem of equations doesnot have a solution ?

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  13. For what value of k system of equations 3x + 4y = 19, y - x = 3 and 2x...

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  14. Which of the folowing pair represent equation of parallel straight lin...

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  15. Which of the following pair of straight lines donot represent intersec...

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  16. The value of K for which system of equation 5x + 2y = k and 10 x + 4y ...

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  17. For what vlaue of K system equation x + 3y = K and 2x + 6y = 2 K has ...

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  18. Values of a and b so that system of equations 2x + 3y = 7 and 2 ax + (...

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  19. For what values of k straight lines 2x - ky + 3 = 0 and 3x + 2y - 1 =0...

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  20. Value of k for which system of equations kx + 2y = 5, 3x + y =1 has u...

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