book Maths Puzzle Numerical Ability

if 2x+1 is a multiple of 5,and if 2x+1<100, how many possible values of x are prime numbers

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Please help me solove for Y:

4/(x-2)+3/xy = 4/5x

Thank you! Find an equation for the line with slope 1/2 and y-intercept 3.
I came up with 2x-y=3. Is this correct?