book Maths Puzzle Numerical Ability

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?

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book Other Question

Jane is twice as old as Tom. In 8 years their ages will total 70. How old is each now? If the graph of a system of equations is interecting lines, the system has how many solution(s).
thanks for your help!