There are two straight lines
y1 = (3/7)x
y2 = (2/7)x + 343
Find "At what POSITIVE value of x, y1 reaches twice of y2 "
i am struggling with this problem from an hour... pls help using geometry only. no calculus pls.

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using geometry? maybe you mean using purely algebra?

ya solving equations... algebra is ok.. . :)

just set y1 = 2y2
make substitutions and solve for x

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