If x+2y=a and x-2y=b which of the following is an expression for x/y?
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Step-by-step explanation:
x+2y=a ____(1)
x-2y=b ____(2)
adding equation 1 and 2
a+b=(x+2y)+(x-2y)
=x+2y+x-2y
=2x
subtracting equation 1 and 2
a-b=(x+2y)-(x-2y)
=x+2y-x+2y
=4y
putting values
=2x÷4y=a+b÷a-b
=x÷2y=a+b÷a-b
x/y=2(a+b/a-b) answer
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