How do you solve this system by elimination?

-3x+4y=12

2x+y=-8

I dont know how to solve it.

At the beginning of the week, the temperature was 15 degrees. during the week, it decreased by 20 degrees. What was the temperature at the end of the week.

At a concert 25% of the audience members were teenagers. if the number of teenagers at the concert was 120, what was the total number of audience members?

An item is priced at $13.74. if the sales tax is 6%, what does the item cost including sales tax?

The area of a rectangle with base b and height h is bh. A rectangular sports goal is 10 ft10 ft wide and 8 ft8 ft high. Find the area of the opening.

Write a two-step equation involving division and addition that has a solution of x equals - 25

Last month the pet store sold 48 birds, 58 fish, and 17 hamsters. The average cost of each pet was $9.25. How many more fish than birds did the store sell? A. Need to know the number of fish and birds sold. B.

8686 rounded to the nearest non zero

Damon plans to buy a snowboard that cost $160. Damon has $40. He will save $20 each week until he has enough to buy the snowboard. Let x represent the number of weeks it will take for Damon to save the money he needs

Using the expression below, choose the correct answers for the new balance and amount of interest earned in the following compound interest problem. P (1 + r) n $1,100 at 8%, for 15 years, compounded annually. Total Amount = $ Interest Amount = $

Which expressions represent the area of the entire shaded region, including the light and dark shading? Select three options. 12a cm2 2b cm2 (6a - b) cm2 (12a + 2b) cm2 (6a + b) cm2