exam Maths Puzzle Numerical Ability

Can you please help me solve for the following problem:

y=-2x+8
x+3y=9

Solve each by using substitution

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exam Other Question

How do you solve this radical? This is a fraction. Radical twenty in the numerator over sixteen as the denominator.
Thank you.
Please help me solve this equation 2t2 - 19 - 6t