Mathematics
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OpenStudy (anonymous):
-x + 3y = 18
-6x – 3y = 3
help me plx
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ganeshie8 (ganeshie8):
add both the equations vertically so that \(y\) stuff cancels out
ganeshie8 (ganeshie8):
-x + 3y = 18
-6x – 3y = 3
-------------------
ganeshie8 (ganeshie8):
add them, wat do u get ?
OpenStudy (anonymous):
what do u mean
OpenStudy (anonymous):
Add downward. The -x +-6x, the 3y+ the -3y and the 18 +3
this will give you a new equation.
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OpenStudy (anonymous):
?x+?y=?
OpenStudy (anonymous):
I'll give you a hint.\[-7x+?y=?\]
OpenStudy (anonymous):
i need 2 answers
ganeshie8 (ganeshie8):
-x + 3y = 18
-6x – 3y = 3
-------------------
-7x + 0 = 21
-7x = 21
x = -3
ganeshie8 (ganeshie8):
you got one answer, x = -3
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ganeshie8 (ganeshie8):
simply substitute x = -3 in first equation, and solve for y
OpenStudy (anonymous):
i still dont get it
OpenStudy (anonymous):
-6x-3y=3
OpenStudy (anonymous):
-6x-3y=3
ganeshie8 (ganeshie8):
we got x = -3
simply put this value in first equation, and solve for y
-x + 3y = 18
-(-3) + 3y = 18
3 + 3y = 18
3y = 15
y = 5
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ganeshie8 (ganeshie8):
so the solution to given system is : x = -3, y = 5
ganeshie8 (ganeshie8):
see if that makes some sense :)
OpenStudy (anonymous):
thank you