The expression represents the graph of a straight line

MATHEMATICS · Multi-part · AoPS · Mathematics · Lines Graphing · Lines Graphing

Problem

The expression

Q(x)=kx+3

represents the graph of a straight line, where

k

is a constant. (i) Find the value of

k

if the line intersects the

x

-axis at

x=5

. (ii) Using the value of

k

obtained in part (i), calculate the

y

-intercept of the line. (iii) Write the coordinates of the zero of

Q(x)

in the form

(x,0)