book Maths Puzzle Numerical Ability

Jane is twice as old as Tom. In 8 years their ages will total 70. How old is each now?

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This is a problem that I have absolutely no idea how to do it.

Calculate the value of b^2 - 4ac and state how many real solutions the equation has 20x = 4x^2 + 25

Would you I am have a problem understanding how to change this equation in the slope-intercept form. Please Help ME. y+2/3=1/2(x-2/5) Can you explain how I go about doing this?

Thanks!!!