EXERCISE 23 C

1.From a table of values showing the coordinates of the points highlighted on each of the graphs given below and hence write the equation showing the relationship between x and y.

(i)

(ii)

(iii)

(iv)

2.Copy and complete the table of values for each equation. Hence,draw the respective graphs.

(i) y=x+5

(ii) y=2x

(iii) y=2x-3

(iv) y=x-5

3.(i)Draw the graph of the function y=5x

(ii) read from the graph, the value of y , when

(i) x=5 (ii) x=6

4.Draw a graph to convert miles to kilometer , given 1 mile=1.6km. Use the graph to find,

(i) how many kilometers are approximately equal to 4.5 mile ?

(ii) How many miles are approximately equal to 8km ?

5.The following diagram shows the temperatures during a day.

fig

(i) Plot the points on a graph and then join points with staright lines.

(ii) Approximately when did the temperature first reach 30 deg C ? Was the temperature increasing or decreasing at this time ?

(iii) For how long was the temperature above 40 deg C?

(iv) By how much did the temperature fall between 4p.m and 6p.m. ?