Solve the equation 506x - 92y + 90 = 498 - 4x + 6y

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?

The sum of a number and 5 times the number is 18.find the number