What is the solution of the following system?

-2x-y=1
-4x-2y=-1

a: infinitely many solutions
b: no solutions
c: (3, 8)
d: (-3, -8)

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?