Book Maths Puzzle Co-ordinate geometry

How do you graph this....
y= -7x + 14

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Book Other Question

How do you find A and B in the equation 12 x^2 = 48 when directed to \"Solve by using the Quadratic Equation.\"? Is there a way to explain the Quadratic Formula in laymans terms??? I am going to teach Elem. Ed, and is there a simpler way to explain it to my students??? Also, is there any proofs for why factoring works?? I've searched and searched, and I cannot find any proofs.