Find a linear inequality with the following solution set. Each grid line represents one unit.
(Give your answer in the form ax+by+c>0 or ax+by+c geq 0 where a,b and c are integers with no common factor greater than 1.)
The points (-1,0) and (1,2) are on the inequality boundary
Imagining the boundary to to be a solid line, the slope is ( 2-0 ) / (1 - -1) = 2/2 = 1
And the equation of this line using ( -1,0) is
y = 1 ( x - - 1)
y = x + 1
Bot we have a dashed line so the equation is either
y > x + 1 or y < x + 1
Note that (-2,0) is in the soltion region and this satisfies y > x + 1
So we can rerrange this as
-x + y > 1
Your answer might also be -1 > x - y ⇒ x - y < -1 ⇒ x - y + 1 < 0