exam Maths Puzzle Numerical Ability

6x-4y+5z=31
5x+2y+2z=13
x_y + z =2

i got x= 46-y-8z, but i'm not sure if thats right i need help...

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exam Other Question

subtract 4 1/4 - 1 1/3 find the exact value of each othe follwoing:
36) cos(alpha)= 1/2, -pi/2<alpha<0; sin(beta)= 1/3,0< beta<pi/2
40) if f(x)- sin x, g(x)= cos x, and h(x)= tan x;
g(alpha + beta)