Y varies directly as x. y=91 when x= 7. find y when x=17?

Science & Mathematics by Anonymous 2018-06-02 10:34:21

Social Science

10 answers

Anonymous

y = 221.
Anonymous

y varies directly as x => y=kx, where k is the constant of proportion x=7 & y=91=> 91=7k=> k=13 y=13x => y=13(17) => y=221
Anonymous

In this case y/x is a constant. So you have 91/7=y/17. You get y= 13*17=221
Anonymous

Y varies directly as x. Hence y=kx when y=91, x= 7 i.e. 91=7k i.e. k=91/7=13 hence y=13x when x= 17 y=13x17=221
Anonymous

y = kx for some k 91 = k(7) k = 13 When x = 17, y = 13(17) y = 221
Anonymous

221. Since x is 1/13 of y, multiply 17 * 13
Anonymous

Since y varies directly as x, the graph of the function is straight line. The slope of the line is 91/7. This is 13. Let’s write the equation for this line. y = 13 * x Let x be 17. y = 13 * 17 = 221 I hope this is helpful for you.
Anonymous

221
Anonymous

91 = 7k y = (91/7)*17 = 221
Anonymous

y = (91/7)x = 13x y(17) = 13*17 = 221