exam Maths Puzzle Numerical Ability

4x=-3y+5
8x=9y
solve each matrix eqaution or system of inequalities by using inverse matrices.
I got the rest of the problems but I don't know how to this one because I don't kn

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exam Other Question

If point A,B and C lie on a coordinate line and points A,B have coordinates 6 and 12 respectively,then w/c of the possible coordinates for point C satisfy d(A,C)<d(B,C)?thank you. Why is it impossible for the absolute value of a number to be negative?