Question

find the value of k for which the system 3x+ky=7 and 2x-5y=1 will have infinitly many sollution​

Answer 1

use cross multiple method

Answer 2

A/Q

It has infinite solution..
So,
$\frac{a1}{a2} = \frac{b1}{b2} = \frac{c1}{c2} \\ so...now... \\ \frac{3}{2} = \frac{k}{ - 5} \\ = > - 15 = 2k \\ = > k = \frac{ - 15}{2} answer$

or k = -35