Question 10 [W. A.S. S.C. E. June 2006 Qn. 2b] Three friends went to a bookshop. The first bought 3
biros and 4 pencils for N30.00. The second bought 2
biros and 5 pencils for N27.00. If the third bought a
biro and a pencil only, how much did he pay?​

step-by-step explanation: you take each of the numbers and divide by the amount then you take the range

step-by-step explanation:

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is