exam Maths Puzzle Numerical Ability

Solve by the substitution method.Type an ordered pair,the solution of the system is???

4x + 3y = -14
x = 5 - 5y
Help please.

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exam Other Question

12/15 = t/5 Find the area of a circular region if the circumference is 16 pie centimeters. Express the answer in terms of pie.

Not sure how to do the symbol for pie.
Thanks