X+ 5y = 8
-x + 2y = -1
how is this solved?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?