book Maths Puzzle Numerical Ability

DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0

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book Other Question

please help me to find the value of "a" in the equation (5)/(a+3)=(3)/(a-2) solve by addition
4x-y=3, 5x+4y=2
a)1,__)
b)-10/21,23/21
c)(__,2)
d) no solution