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OpenStudy (anonymous):
any questions?
OpenStudy (rissyroo118):
Which of these ordered pairs is a solution to the inequality 3x + y > – 8?
(Points : 1)
(–3, 0)
(–2, –1)
(0, –10)
(2, –16)
jimthompson5910 (jim_thompson5910):
let's check the first point (-3,0)
jimthompson5910 (jim_thompson5910):
3x + y > – 8
3(-3) + 0 > – 8 ... plug in (x,y) = (-3,0)
-9 + 0 > -8
-9 > -8 ... this is false, so (-3,0) is NOT a solution
jimthompson5910 (jim_thompson5910):
So you're looking for points that make the inequality true
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OpenStudy (rissyroo118):
now what about -2,-1
jimthompson5910 (jim_thompson5910):
plug in x = -2, y = -1 and tell me what you get
OpenStudy (rissyroo118):
nope a & b are incorrect!
OpenStudy (rissyroo118):
as i do them , none have came out to being right
jimthompson5910 (jim_thompson5910):
when you plug in x = -2, y = -1, what do you get on the left side?
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OpenStudy (rissyroo118):
i get -7
jimthompson5910 (jim_thompson5910):
so you'll have -7 > -8
is that true or false?
jimthompson5910 (jim_thompson5910):
draw a number line if you have to
OpenStudy (rissyroo118):
that would be true
jimthompson5910 (jim_thompson5910):
so (-2,-1) is a solution
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OpenStudy (rissyroo118):
yes!!! thank you
jimthompson5910 (jim_thompson5910):
you're welcome
OpenStudy (rissyroo118):
Which of these ordered pairs is a solution to the inequality y – 2x ≤ –3?
(Points : 1)
(2, 4)
(–2, 3)
(3, 4)
(1, –1)
could you help me with this one as well?