book Maths Puzzle Numerical Ability

2a=3b-13
b=2a+7

Use substitution method to solve system .
If system is dependant or inconsistant so indicate.

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book Other Question

Translate the following English sentences into symbols, letting the letter P stand for "Peter studies logic" and the letter S stand for "Susan studies logic."
1. Either Peter or S Find the real solution, if any. Use quadratic formula and calculator.
x^2+sqrt2x-2=0

Thanks Caroline