The lengths, in cm, of the sides of a triangle are 3x - 5, 2x - 1 and x + 1 2x - 1
3x - 5
四
x + 1
(a) Write down an expression, in terms of x, for the perimeter of the triangle.
(2)
The perimeter of the triangle is 31 cm.
(2)
(b) Work out the value of x.
question 1 is 4 marks)​