At the soulvenier souvenir shop Gabe bought 2 keychains and 1 T-shirt for a total of $7. At the same shop, Rosa bought 3 keychains and 2 T-shirts for a total of $13. Write and solve a system of linear equations to determine the cost of each item.

Ithink it's the first one ( let me know if it right)

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.