book Maths Puzzle Numerical Ability

what is the slope of y=1/2x-1/2
y=-1/3x-3

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book Other Question

If w, x, y, and z are on-negative integers, each less than 3, and w(33) + x(32) + y(3) + z = 34, then w+z=
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4 The solutions of x2-7x+12=6 are