book Maths Puzzle Numerical Ability

Use the quadratic formula to solve the equation.

x^2 +7x+6=0

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book Other Question

I need a fast and easy way to understand how to solve expressions with variables using subtiution, so could you please give me examples and if possible help me understand these types of problems better. 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!