Brodetsky, Selig, 1888-1954 · London, G. Bell and Sons, Ltd. · leaf 31
SIMULTANEOUS EQUATIONS 13 Hence we get, since all the scales are graduated alike, twice graduation x =graduation a -^graduation b, 3 times graduation y ^graduation a+twice graduation b. … If now we consider a and b as two unknown quan- tities, we have for them the two equations, a-\-b=twice graduation x, a +26 =3 times graduation y. Suppose now we have to solve the simultaneous equations a + 6 = 7, a+2b = l2; we take the graduation 7/2, i.e. 3-5 on scale x, and the graduation 12/3,…
Nomography (Mathematics)
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