Answer:
A system of linear equations is just a set of two or more linear equations. In two variables (x and y) , the graph of a system of two equations is a pair of lines in the plane.
Step-by-step explanation:
The lines intersect at infinitely many points. (The two equations represent the same line.)
Answer:
126
Step-by-step explanation:
9 ÷ 20 = 0.45
280 × 0.45 = 126
Area=

divide diameter with 2 to get radius 13/2= 6.5
area= pi 6.5x6.5
=
42.25
answer= 42.25