exam Maths Puzzle Numerical Ability

I know this might not be the right type of problem but i guessed.

how many solutions does the system have? 2x-3y = 11
6x-9y = 33

a. 0
b. 1
c. 2
d. infinite

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exam Other Question

This is a homework assignment not in the book. Ra226 has a half-life of1600 years. How many grams of Ra226 will be present after 2000 years if there are 20g present initially? the quadrilateral with vertices P(6,3), Q(2,-2), R(1,7) and S(x,y) is a parallelogram. Find (x,y) algebraically.