Factorise 2tv+t-10v-5
and make the k the subject ​

(2v + 1)(t - 5)

Step-by-step explanation:

The first two terms of 2tv+t-10v-5 factor into t(2v + 1); the last two terms factor into -5(2v + 1).  Thus, (2v + 1) is a factor of 2tv+t-10v-5:

2tv+t-10v-5  = (2v + 1)(t - 5)

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)