book Maths Puzzle Numerical Ability

Solve for x y=1/3x=-2 could you plese help me someone

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book Other Question

1. Write a formula that describes the function for: A large pizza costs $12.00 plus 30 cents for each topping. Express the total cost C as a function of the number of toppings t.

2. Graph 5y - 3x >= 25 i need help factoring trinomials with a coefficient of x2 greater than 1 for example 3x2(square)+10x+8