The diagram shows a pentagon. It has one line of symmetry.
AE= 4x
AB= 2x+3
BC= x+1
All these measurements are given in centimetres. The perimeter of the pentagon is 21cm.
A)Write an equation, in terms of x, for the perimeter of the pentagon.
Your final line should be in the form ax+b= 21 where a and b are.
B) find the value of x