[R] Intercept between two lines

[pannigh]

Dear List,
I know this is not the first post on this topic, but I need basic help I
guess. Assuming the simple case of two lines with one intercept, how can I
make R calculate this intercept, NOT using locator().

par (xaxs="i", yaxs="i")
plot( 1, bty="n" ,xlim=c(0,300) , ylim=c(0,300) , xlab="X", ylab="Y")
    curve(100-0.5*x, -50,250, add=T, col="blue")
    curve(150- x   , -50,250, add=T, col="red")

I want R to come up with the coordinates X=100, Y=50.

Thank you for your help!



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