solve for y =
let's look at the coordinates given (x,y): (2,-1),(2,1),(-2,1),(-2,-1)
Test first x=2,
y=2(2)+4=8, so the point on the line y=2x+4 is (2,8)
Test second point x=-2,
y=2(-2)+4=0, so the point on the line y=2x+4 is (2,0)
let's now take a look at inequality, but first reorganize solving for y=
y≥2x+4, so the y is GREATER or equal than the 2x+4 answer, we have no answer which is equal, but which y values are Greater? for x = 2, is y = -1 greater than 8 (part 1 before), no, is y=1 greater than 8, also no.
Now same test, for x = -2, is y = 1 greater than 0 (from part 2 before), YES, is y=-1 greater than 0, also no.
Answer: only point (-2,1) satisfies the inequality