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Sheilahas 15 markers according to the givencondition.How to form an equation?Determine theknownquantities and designate theunknownquantity as a variable while trying tosetup orconstructa linear equation to fit a real-world application.An equation is asetofvariablesthat are constrained through a situation or case.Let's saySheilahas an S number of markers whileDavehas D.Now,Sheilahas 5 times as manymarkersas Dave.So,S = 5DTogetherS + D = 18Bysubstitution,5D + D = 18D = 3So,S = 5(3) = 15Hence "Sheilahas 15 markers according to the givencondition".For more about theequation,brainly.com/question/10413253#SPJ2...