Question 46 of 49advanced🔧 ApplyLong Answer5 marks

The graph of a linear polynomial p(x)p(x) passes through the points (1,5)(1, 5) and (3,11)(3, 11).

(i)

Find the polynomial p(x)p(x).

Answer

p(x) = 3x + 2

(ii)

Find the coordinates where the graph of p(x)p(x) cuts the axes.

Answer

The graph cuts the y-axis at (0, 2) and the x-axis at (-2/3, 0).

(iii)

Draw the graph of p(x)p(x) and verify your answers.

Answer

Plot the points (1,5)(1, 5), (3,11)(3, 11), (0,2)(0, 2), and (−23,0)\left(-\frac{2}{3}, 0\right) on a graph paper, join them with a ruler, and extend the line. Verification is done by substituting the coordinates into the equation p(x)=3x+2p(x) = 3x + 2 to ensure they satisfy it.

Explanation

The student identifies the linear polynomial as p(x)=ax+bp(x) = ax + b, sets up a system of linear equations using the given points, and solves for aa and bb. Then, the axes intercepts are found by setting x=0x = 0 and y=0y = 0 respectively. Finally, the graph is drawn by plotting these points, and verification is done by checking if the points satisfy the derived equation, as mentioned in the context.