Guess the number please

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is . reset next

Pls never taught i’m really confused and i rlly need