...of 30 miles an hour, 120 miles in 5 hours at the rate of 24 miles an hour ; and 40 90 120 2 x 20 3 x 30 5 x 24' 5. One quantity is said to vary directly...second and inversely as a third, when it varies as the first and the reciprocal of the third jointly. Thus, if x varies directly as y and inversely as z,...

...quantity is said to vary directly as a second and inversely as a third, when it varies as the first and the reciprocal of the third jointly. Thus, if x varies directly as y and inversely as z, then —т- = k. a constant : or — = ft. x , , аж 7 ,-i 6.1/x depend only on у and г, and if x varies...

...rate of 20 miles an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 5. One quantity is said to vary directly...jointly. Thus, if x varies directly as y and inversely as 2, then x 7 , a» , — т- = k, a constant ; or — = k. »'i ' ?/ 6. In all the preceding cases of...

...an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 25. One quantity is said to vary directly as a second...x varies directly as y and inversely as z, then x _ , xz 7 — -r = k. a constant : or — = fe. '•} Ex. 1. If x ce y, and x = 3 when y = 5, what is...

...an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 25. One quantity is said to vary directly as a second...of the third jointly. Thus, if x varies directly as у and inversely as z, then X XZ т- = k, a constant ; or — = fc. z 26. In all the preceding cases...

...11 and D both vary, W к M x D ; if M ¡s constant, W к D; if D is constant, W x 31. One variable is said to vary directly as a second, and inversely as a third, when it varies as the product of the second into the reciprocal of the third. That is, у varies directly as x, and inversely...

...an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 25. One quantity is said to vary directly as a second...if x varies directly as y and inversely as z, then — 5- = k, a constant ; or — = k. ".I Ex. 1. If x ос у, and x = 3 when у = 5, what is the value...

...an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 25. One quantity is said to vary directly as a second...of the third jointly. Thus, if x varies directly as у and inversely as z, then — j = fc, a constant ; or — = k. У.~ У z Ex. 1. If x ос y, and...

...y and z, x is equal to, their product multiplied by a constant. 348. One quantity or number varies directly as a second and inversely as a third when it varies jointly as the second and the reciprocal of the third. Thus, the time required to dig a ditch varies...

...rate of 20 miles an hour, 90 miles in 3 hours at the rate of 30 miles an hour, 40 90 120 and 2 x 20 3 x 30 5 x 24 5. One quantity is said to vary directly...x varies directly as y and inversely as z, then x , a* , - = к, a constant ; or — = к. У-- ' "' У 6. In all the preceding cases of variation, the...