3. solve the system of equations by substitution.

x= -4y
x+5y=2

a. (-8,2)
b. (8,-2)
c. (2/9,-8/9)
d. (-12,3)

4. solve the system of equations by elimination.

3x+4y=31
2x-4y=-6

a. (4,5)
b. (5,4)
c. (-5,12.5)
d. (5,-4)

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression