Answer:
Step-by-step explanation:
the question is pretty brief, but, in simple terms, you can solve the matrix and find the variables to the solution you may know, when you augment the matrix with a solution you have, you can find the formulas .... if that makes sense?
x+3x= 4x
Because there is a invisable 1 in front of the X. Hope this helps!
the area of the shape is 8cm
Answer: D