exam Maths Puzzle Numerical Ability

Hello, I need help with some domain problems,the first problem is,solve y= -2x+7 if the domain is {-2,0,4,7}.The next one is,find the domain of x minus 2y=1 if the range is {-2,0,5

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exam Other Question
a ladder that is 13m long is placed so that its foot it 3m from the base of a vertical wasll . how far does the laddr reach up the wall Solve. -9(x - 3)^2 = -7

Another difficult problem that I need help with, please.