exam Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.

16. 5x -2y = -5
y-5x = 3

20. 8x -4y = 16
y= 2x -4

28.) 4x -12y = 5
-x + 3y= -1

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exam Other Question

x^2-4-0 , 3x+x^2=0, x^2-10x+2=0 , 4x^2-16x=-16 Help, its going for midnight and We are clueless on this
6< x -6<_ 8

I cant find the right keys but its 6 isd less than x minus 6 less than or equal to 8