geometry
posted by Anonymous .
In triangle ABC,
• AB is x cm long
• BC is twice the length of AB
• AC is 10 cm longer than AB.
The perimeter of the triangle is 42 cm.
Write down an equation in x and solve it.
Use your answer to find the lengths of the sides of the triangle.

BC=2x
Ac=x+10
permiter=42=x+2x + 10+x
solve for x