book Maths Puzzle Numerical Ability

solve by addition
4x-y=3, 5x+4y=2
a)1,)
b)-10/21,23/21
c)(,2)
d) no solution

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book Other Question

DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0 Perform the following complex number multiplication and write the answer in standard form:

(2 - i)(-6 + 6i)