PLEASE ANSWER ASAP!
Which system of equations has only one solution?
4 x + 2 y = 8.- 4x - 2 y = 3.
-5 x + y = 6. 5x - y = -6.
-3 x + 4 y = 2. 3x - 4y = 0.
2 x + 4 y = 6. 3x - 4y = 9.

Katlyn made 4 dresses with 7 yards of fabric. how many yards did she use on 1 dress?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?