exam Maths Puzzle Numerical Ability

In the days before cars, railways called "inclines" brought people up and down hills in many cities. In Johnstown, Pennsylvania, the Cambria Inclines was reputedly the steepest in

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Problem #10
Solve the system by addition. Be sure to state the solution.

5x - 7y = 5
x + 3y = 1

Problem #11
Slove the system by graphing. Be sure to state the solution.
2x - 2y = 10
x + y = 3
x = 4 ABC is a triangle. ABD is a triangle within triangle ABC. Angle DBA is congruent to angle ACB.

Prove (AC)(AD)= (AB)squared.

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