Your system of equations is
Then the solution is
Your graphing calculator or any of several web sites can compute the inverse matrix for you.
The solution is (x, y, z) = (6, 4, 3).
A=45
A=kx/y
where k is constant
substituting the values for k
k= 20×9/6=30
when x=9, y=6
A= 30×9/6=45
Answer:
3 9/14
Step-by-step explanation:
40% of 280 is 112 so to increase by 25% it must increase by 28