exam Maths Puzzle Numerical Ability

find the value of k so that the equations 16x-ky=8 and 4x-4y=7 will have a dependent system

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hello I am having a difficulty with the following equation: Write an equation of the line through (1,-3) and (-2,6). Five 7th grade friends are standing in line to pick up their lunch. Laura is the 20th person behind Rayma. Rayma is the 50th person ahead of Deanna. Deanna is the 10th person behin