exam Maths Puzzle Numerical Ability

solve by graphing.

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

x = 3 ??

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exam Other Question

Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n hey i dont unnderstand this and niether do my parents.
graphing systems of equations.
ok. heres one of my questions.

-5x=-21+6y
-5x+1y=-84

and i have to find a solution but dont know how
please help if you can thx bye