What is 1x+2y=5 when you can use any number to solve for x

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

What are the solutions to the following equation? |m| = 8.5 the value of m is equal to 8.5 and because each distance from zero is 8.5.