exam Maths Puzzle Numerical Ability

my problem says; solve by addition
x+3y=1
2x-3y=-16
thank you

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exam Other Question

S(t) = 58 - 6.8In(t + 1)
models the typing speed S,in words per minute, of a student t months after the student completes a typing class.
a. What is the student's typing speed, Word problem where the sum equals 9.90 the question is how many are dimes and how many are quarters if there are twice as many dimes as quaters. How do you set up this word problem to arrive at the answers for the numbers of dimes and quarters.