book Maths Puzzle Numerical Ability

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Five times some number is 10 less than the number. What is the number?

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Q. If (-3,6) is a point on the graph of y=f(x), what point do you know is on the graph of y=f(x+3)? Q. How would you solve both of these equations. y^2 = 5x + 2x - 2. the next equation i don't understand is y= 3x^4 + 4x + 1. For both of these i need to know the y-intercept, the x-in