exam Maths Puzzle Numerical Ability

Could someone be so kind in helping me with this problem?

I need to solve the following systems by substitution:

4x - 12y = 5
-x + 3y = -1

Thanks so much,
Ashley

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HOW DO I EXPRESS EACH RATIO AS A UNIT RATE ROUNDING TO NEAREST TENTH OR CENT? EXAMPLE: 145 MILES IN 3 HRS i think this is what i'm doing??? but i really need help!!!