exam Maths Puzzle Numerical Ability

Solve the following system of equations algebraically:
y = x^2-6x+6
y-x= -4

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exam Other Question

If a piece of real estate purchased for $75,000 in 1998 appreciates at the rate of 6% per year, then its value t years after the purchase will be f(f)=75,000(1.06^t). According to (Use 4 steps)
Given: a and c are vertical angles formed by lines n and m.

Prove: a = c

Pls. use the two column proof...
The statement and the reason for this proof...