book Maths Puzzle Numerical Ability

-9+13g=11-g

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book Other Question

. Solve the following system by substitution.
4x - 12y = 5
-x + 3y = -1
I cannot figure out how to work this problem: Find the value of k so that the slope of the line is 3/2. (2+k)x+(2-k)y=15 . Any help would be greatly appriciated.