book Maths Puzzle Numerical Ability

if 1 more than a certain numver is 3 less than a second number ,the larger of these numbers minus the smaller is equal to
a0
b1
c2
d3
e4

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book Other Question

Find an equation of the line (in either general form or slope intercept form) that contains the centers of the following two circles:

x^2+y^2-4x+6y+4 = 0 and x^2+y^2+6x+4y+9 = 0 Please help me to do this equation 15-4x=42-7x