exam Maths Puzzle Numerical Ability

please show me how to work these problems using the substitution method:

1/2x+1/3y=3
y=3x

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exam Other Question

How many numbers between 100 and 200 (Inclusive) have an even number of factors?

Is there a formula for figuring this out or some sort of pattern? Thankyou Solve each of the following equations for x.

5 over x + 6 PLUS 2 over x squared + 7x + 6 EQUALS 3 over x + 1

2 over 5 = x - 2 over 20