How do you solve the system of equations using elimination?4s+7c=1257s+5c=110

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to solve using elimination, you must make sure that 2 of the 4 variables are the same value and are opposites, positive and negative. Then, cancel them out and solve for the remaining variable. Then, take that value, plug it back in, and find the other value. The answer to this problem is c=15 and s= 5