Question

Hello! Please Help Its just one simple Question ^^

Answer 1

$\\ \sf\longmapsto f(x)=112-kx$

• f(-3)=121

Put -3 in f(x)

$\\ \sf\longmapsto f(-3)=121$

$\\ \sf\longmapsto 112-k(-3)=121$

$\\ \sf\longmapsto 112+3k=121$

$\\ \sf\longmapsto 3k=9$

$\\ \sf\longmapsto k=3$