Solving Linear Systems by Adding or Subtracting

solve each system of linear equations by adding or subtracting. Check your answer.

3x-5y=60

4x+5y=-4

The mean of twenty numbers is 42. If four of the twenty numbers have a mean of 50, what is the mean of the other sixteen numbers?

Tyger is trying to eat less sugar in his diet. He reduces his sugar intake from 15 spoons a day to 9 1/2 spoons a day. What is the percentage reduction in his sugar intake.

Write an expression for each statement. Then solve. 5 times the difference between 19 and 13

Write the expression using exponents. 8⋅w⋅w⋅w⋅w

A car can be rented for?$55 per week plus?$0.75 per mile. how many miles can be driven if you have at most?$340 to spend for weekly? transportation

Choose the correct translation for the following statement. It must exceed seven.

A diver is 4 meters below sea level. What integer represents the location of the diver?

How bigger is a 1 ¼ inch button than a ⅝ inch button

What is the slope of a line represented by the equation 2y=x-4

The first year of a charity walk event had an attendance of 500. The attendance y increases by 5% each year. How many people will attend in the 10th year?