if (1,-1)is a solution of linear equation 2x-(2a+5)y,find the value of a.
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put the value of x=1 and y= -1 in the eqaution
hence 2(1)-{2a+5}(-1)=0
= 2-(-2a-5)=0
2+2a+5=0
2a+7=0
a= -7/2
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