What is the value of b^2 - 4ac for the following equation?

2x^2 + 3x = -1

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

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?