book Maths Puzzle Numerical Ability

Sliced turkey cost $3.20 per pound. Roast beef cost twice as much, & ground beef cost half as much as the turkey. Find the price of 7.5 pounds of ground beef.
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Thank you for making this resource available to me. I am struggling with a word problem.Here goes:
"Are those your children I hear playing in the garden?" asked the visitor. Write solution as a coordinate. Then graph on the graph provided and label the solution. Label the x and y axis for each problem.

x+3y=-5
2x-3y=8

PLEASE HELP!