How to solve x+y=12 and y=2x using substraction?
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x+y=12(1), y=2x(2) give then solution- Putting the value of y in equation 1 and then x+2x=12 , 3x=12 , x=4 ..then x of value putting in eqn 1 then ×=3
x=3 not ...y=12-4=8
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Answered by
6
x + y = 12
x + 2x = 12 ( y = 2x )
3x = 12
x = 4
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Answered by
6
x + y = 12 ----------(1)
y = 2x ----------(2)
Substitute the value of y from eqⁿ (2) in eqⁿ (1), we get
x + 2x = 12
3x = 12
x= 12/3
x = 4
Substitute the value x=4 in eqⁿ(2), we get
y = 2×4
y = 8
Hence, x = 4 and y = 8
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