Explain a word equation that y=2x shows

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.