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Mathematics 12 Online
OpenStudy (ritoking):

What is the x-intercept of the line with this equation −2x+12y=18 ?

OpenStudy (dumbcow):

The line crosses the x-axis when y= 0 To find x-intercept, plug in y = 0 and solve for x value

OpenStudy (ritoking):

So would i have to multiply the 12 by 0 to get y so far? i've never done this before at all so im clueless haha

OpenStudy (dumbcow):

yes you replace "y" with 0 ---> -2x + 12(0) = 18

OpenStudy (ritoking):

crap i messed up the equation, the 12 is supposed to be 1/2y

OpenStudy (dumbcow):

thats ok, either way you multiply it by 0

OpenStudy (ritoking):

alrighty, so what do i do for the next step? I know that the equation is now -2x + 0y = 18, but you can't add up two numbers with different letters.

OpenStudy (dumbcow):

well 0*anything = 0 right? the y variable goes away, use algebra to solve for x ---> -2x = 18

OpenStudy (ritoking):

would the answer possibly be -9?

OpenStudy (dumbcow):

yes correct, 18/-2 = -9 Make sure you write the answer as a point ----> x-intercept is (-9,0)

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