exam Maths Puzzle Numerical Ability

4x -12y =5
-x +3y = -1
how do you solve this using the substitution method

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exam Other Question

Write each of the following ratios in simplest form: The ratio of 5 3/5 to 2 1/10.

My final answer is: 280/50

28/5 = 21/10 then i flip the second fraction to times the first one. 28/5 x 10/21 = 280/50

Is that the right way to do it? How would you solve x/3+2=-5 ?