exam Maths Puzzle Numerical Ability

Please help w/ the following:

How many real solutions does this nonlinear system have?
{{{x^2+y^2=25}}}
{{{x+y=9}}}

Thank you.

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exam Other Question

A used car dealer sold two cars and received $560 for each car. One of these transactions amounted to a 40% profit for the dealer, whereas the other amounted to a 20% loss. Show that the dealer�s net profit on the two transactions was $20.
Simplify: 6(2x +3)

Simplify: -3b(5a - 3b) + 4(-3ab - 5b2)

Simplify: 4(2 - x) - 3(-5 - 12x)

Simplify: 5(a - 3b) + 2(-b - 4a)

Simplify: 2a - {6b - 4[a - (b - 3a)]}

Ev