Question

what is the value of k, if (k,5) is the solution of the simultaneous equations 4x+3y=19 and 4x-3y=-1?​

Answer 1

since (k,5) is solution of the given equations.

then put x = k , and y = 5

4k+3×5=19

4k=19-15=4

4k=4

k=4/4=1