-550 write a true number sentence

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What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?