In addition, from the response shown, using a graphical calculator brings the following benefits:
1) You can write the system of linear equations as big as you want. This is: systems 3 * 3, 4 * 4, 5 * 5.
2) The response to systems of equations greater than 2 * 2 can be complicated when you graph the solution, therefore, the graphing calculator can be much more efficient in these cases.
3) You can write the linear equations in any way. Resolving by hand you should probably rewrite the system of equations to find the solution.
First, lets start in inches. multiply 45 by 3, to get 135 feet, and add that with 10.5 to get 145.5 feet. multiply that by 12 to get 1746 inches, and add 54 to that to get 1800 inches. divided that by 12 to get 150, and divided 150 by 3 to get 50.
To get the answer first we have to find full numbers. We can use proportion 2/3 ----------------------- 375 1 -------------------------- x Crossmultiply now 2/3*x=375 /:2/3 x= x= - its the answer A) Now we have to find how much were originally on the card. To get the answer we can just multiply 562 times 1/4. 562*1/4=140 - its the asnwer B)