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

Show that for s (semiperimeter), r(radius of inscribed circle), and r 9radius of circumscribed circle), abc = 4srR. In which of the following is y a function of x

a. 3y+2x-9=0
b. x+y^2=5
c. x^2+y^2=25
d. noone of these