book Maths Puzzle Numerical Ability

help me solve this equation please
{{{x + y for x= 13 over 4,y= -5 over 2}}}

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book Other Question

{2a+3b=12
{5a-b=13 please help me ,,,,thank you the value of a building lot this year is $78,000. this is three times its value 18 years ago. find its value 18 years ago. thank-you