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Mathematics 16 Online
OpenStudy (linn99123):

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

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" ?

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

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

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

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

OpenStudy (linn99123):

wouldnt it be 3???

jimthompson5910 (jim_thompson5910):

correct

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