What is the solution to this system of equations?

x + 2 y = 4. 2 x minus 2 y = 5.
(3, Negative 5 and one-half)
(3, one-half)
no solution
infinitely many solutions

Find the equation using the point (4,8)

Klmn and pqrs are similar trapezoids. which side of pqrs corresponds to lm

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?