How do you find the value of x and y for
4x+5y=102
7x+5y=126
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OpenStudy (anonymous):
Elimination, substitution, matrix, graph? which method?
OpenStudy (anonymous):
Solve the first equation for y, then plug that into the second equation to solve for x. Once you know x you can plug that into the first equation to find y.
OpenStudy (anonymous):
i was thinking substitutio imranmeah
OpenStudy (anonymous):
but how do i solve for y?
OpenStudy (anonymous):
4x+5y=102
7x+5y=126
We will solve by elimination
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OpenStudy (anonymous):
We want y to cancel to we multiply one equation by -1
4x+5y=102
-7x-5y=-126
----------------
-3x=-24
x=8
OpenStudy (anonymous):
Now plug that x value back in to find y value
4(8)+5y=102
32+5y=102
5y=102-32
5y=72
y=14.4
OpenStudy (anonymous):
alright!
OpenStudy (anonymous):
that really helps!
OpenStudy (anonymous):
how does that cancelling work?
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OpenStudy (anonymous):
5y and -5y cancel when you add them
OpenStudy (anonymous):
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