I have homework and i dont understand it its called "Solving Systems of Equations by Elimination." The problem im stuck on is

8x+y=-16

-3x+y=-5

I need the answer and how to do it.

Kendra's water bottle contains 2 quarts of water she wants to add drink mix to it but the directions for the drink mix give the amount of water in fluid ounces how many fluid ounces are in a bottle

At the green house of salad you get a $1 coupons for every 3 salads you buy. What is the least number of salad you could buy to get $10 in coupons

What is the distance between (-5,8) and (4,6)

Figure consists of a tangent and a secant to the circle. Solve for x

Two third grade classes are going to the High Museum of Art. There are 56 students attending the field trip. If each van can carry 10 students, how many vans will be needed for the field trip?

Round 494 to the nearest ten

Two fair dice are tossed. a. What is the probability that the sum of the number of dots shown on the upper faces is equal to 7? To 11? b. What is the probability that you roll "doubles" that is, both dice have the same number on the upper face? c.

Least common multiple of 78 90 140

Given the speeds of each runner below, determine who runs the fastest. Katie runs 14 feet per second. Zach runs 576 feet in 46 seconds. Tony runs 1 mile in 533 seconds. Will runs 827 feet in 1 minute.

What is the mean average diviation