if the lines 2x+3y-10=0 and 3x-ay-25=0 are perpendicular then the value of a is
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Answer:
The first straighr line D1 : 2x+ky=11
And 2nd straight line D2 : 5x-3y=-4
D1 => y= -2x/k +11/k
D2 => y= 5x/3 +4/3
D1 is perpendicular to D2 only if product coefficient of their slope is = -1.
=>( -2/k) *(5/3)=-1 => k/2 = 5/3
=> k=10/3
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it is a Gp
solve it with gp method
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