3x - 2y = 10
5x + y = 4

When solving this system of equations by elimination, which could be the resulting equation when a variable has been eliminated?
A) 13x = 18
B) -7x = 2
C) -7y = 62
D) 8x - y = 14

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning