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2x + 4y = 205
3x + 8y = 342.50
We can make the y terms cancel by multiplying
the first equation by -2, to make the + 4y
become - 8y so it will cancel with the + 8y
in the second equation:
-4x - 8y = -410
3x + 8y = 342.50 Then we add the equations term by term:
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-x = - 67.50
x = 67.50
We can make the x terms cancel by multiplying
the first equation by -3, to make the 2x
become -6x, and multiply the second equation
by 2 to make the 3x become 6x so the -6x will
cancel with the 6x in the second equation:
-6x - 12y = -615
6x + 16y = 685 Then we add the equations term by term:
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4y = 70
y = 17.50
Edwin
