Asked by Peter

Find the coordinates of any vertices formed. 3x + 4y ≥ 12, 5x + 6y ≤ 30, and 1 ≤ x ≤ 3.

I tried graphing this, which formed a parallelogram, but it was hard to find eyeball vertices.
Answered by Steve
That's what algebra is for. Pair up the equations to fin the intersections:

3x+4y = 12
5x+6y = 30
x = -16 and y = 15

and likewise for the others. No eyeballing needed.
Answered by Peter
Shouldn't it have 4 points due to 4 vertices?
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