book Maths Puzzle Numerical Ability

3x-2y=11
-x+6y=7

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find all the roots of each equation.
x^4+4x^3+6x^2+8x+8=0 I do not understand input-output tables. The directions say " Make an input-output table for the function. Use 0,1,2,and 3 as the domain" The first question says "y=3x+2" Please he