exam Maths Puzzle Numerical Ability

Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular.
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Linear System Word Problems

Please help me figure this out.
The cost of 12 oranges and 7 apples is $5.36. Eight oranges and 5 apples cost $3.68. Find the cost of each orange and each apple.

Thank you
Ryan 8/5 = 40/y