hat are the intercepts of the line 6x-9y=18 ?
A.
x-intercept: –3; y-intercept: 2
B.
x-intercept: 3; y-intercept: –2
C.
x-intercept: –2; y-intercept: 3
D.
x-intercept: 2: y-intercept: –3
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OpenStudy (zzr0ck3r):
what is y when x is 0?
what is x when y is 0?
OpenStudy (linn99123):
im not shre D:
OpenStudy (zzr0ck3r):
let x = 0......
\(0-9y=18\rightarrow -9y=18\)
what is y?
OpenStudy (linn99123):
2?
jimthompson5910 (jim_thompson5910):
-9y=18
means
-9 times SOMENUMBER = 18
what is that "SOMENUMBER" ?
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OpenStudy (linn99123):
3?
OpenStudy (linn99123):
@jim_thompson5910
jimthompson5910 (jim_thompson5910):
-9*3 = -27 not 18 like we want
OpenStudy (linn99123):
would it have to be -3 then?
jimthompson5910 (jim_thompson5910):
fill in the blank
9 * _____ = 18
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OpenStudy (linn99123):
Its 2
jimthompson5910 (jim_thompson5910):
so what would go in the blank for this one
-9 * ________ = 18
OpenStudy (linn99123):
2 ?
jimthompson5910 (jim_thompson5910):
but negative times positive = negative
jimthompson5910 (jim_thompson5910):
we want a positive result
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OpenStudy (linn99123):
how do we get one tho :o?
jimthompson5910 (jim_thompson5910):
do you remember that negative times negative = positive ?
OpenStudy (linn99123):
ohh so its -9 * -2
jimthompson5910 (jim_thompson5910):
correct
jimthompson5910 (jim_thompson5910):
so solving -9y = 18 gives you y = -2
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jimthompson5910 (jim_thompson5910):
that's the y-intercept (because you plug in x = 0 and solve for y to get y = -2)
jimthompson5910 (jim_thompson5910):
to find the x-intercept, plug in y = 0 and solve for x