exam Maths Puzzle Numerical Ability

Elimination: How do you solve these two problems:
r - 3p = 1
6r - p = 6

-2x + y = 3
x + 4y = 3

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exam Other Question

two angles are supplementary. One angle measures 30 less than twice the other. What are the measures of the angles? Factor: z2 � 14z + 49
A) (z � 7)2
B) (z � 7)(z + 7)
C) (z � 14)(z + 1)
D) The expression is prime.