book Maths Puzzle Numerical Ability

I have a question for you:
what are the x and y coordinates of x-2y=4 how would i graph that?
thanks for your help!

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book Other Question

Use the quadratic formula to solve the equation.

x^2 +7x+6=0
Use the Intermediate Value Theorem to show that the graph of the function has a zero in the given interval. Round the zero to two decimal places.
f(x) = 2x3 + x2 - x - 5; [1, 2] Please help