Solve a system of equations using substitution: word problems

lina is comparing the cost of a fresh lobster dinner at two different restaurants. the first restaurant charges $39 for the meal, plus $7 per kilogram for the lobster she picks. at the second restaurant, lina would pay $2 per kilogram for the lobster, in addition to $44 for the meal. lina realizes that, in theory, dinner at both restaurants could cost the same amount if the lobster had a certain weight. how much would lina pay for her dinner? what is the weight?

dinner would cost $ at either restaurant if lina's lobster weighed kilograms.
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