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Mathematics 19 Online
OpenStudy (mwhit2101):

edited

OpenStudy (mwhit2101):

@iambatman @ganeshie8

ganeshie8 (ganeshie8):

you want a point that satisfies both the equations y = x-2 y = -2x+7

ganeshie8 (ganeshie8):

since the left hand sides are equal, the right hand sides also must be equal. set them equal and solve x first : \[x-2 ~= ~-2x+7\]

OpenStudy (mwhit2101):

What next?

OpenStudy (mwhit2101):

Yes I see how you combined them, that part makes sense I think

ganeshie8 (ganeshie8):

group like terms and isolate x

ganeshie8 (ganeshie8):

maybe start by adding 2x both sides

ganeshie8 (ganeshie8):

\[x-2 ~= ~-2x+7\\\color{gray}{+2x~~~~~~~~~~~+2x~~~~~~~~~~}\]

ganeshie8 (ganeshie8):

\[3x-2 = 7\]

OpenStudy (mwhit2101):

does that make it\[3x-2=7\]

OpenStudy (mwhit2101):

yes haha :D

OpenStudy (mwhit2101):

Ok and then add 2 to both sides?

ganeshie8 (ganeshie8):

yes your goal is to isolate x

OpenStudy (mwhit2101):

3x=9 x=3

OpenStudy (mwhit2101):

So theres the x part. What about y?

ganeshie8 (ganeshie8):

Correct! plug that back into any of the given equations and solve y

OpenStudy (mwhit2101):

y=-2x+7 y=-2(3)+7 y=-6+7 y=1

OpenStudy (mwhit2101):

YAY!!! Thanks so much!!!for your help!

ganeshie8 (ganeshie8):

good job! yw:)

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