4. *QRST-WXYZ. The area of QRST is given. Find the area of WXYZ. A=144
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First Let we solve the Original system of equations:
equation (1):
equation (2):
Multiplying equation (1) by 7, we get
Subtracting,
implies
Then
Thus the solution of the original equation is
Now Let we form the new equation:
Equation 2 is kept unchanged:
Equation (2):
Equation 1 is replaced with the sum of equation 1 and a multiple of equation 2:
Equation (1):
Now solve this two equations:
Multiply (1) by 7 and (2) by 8,
Subtracting, implies
Then x=2.
so the solution for the new system of equation is x=2, y=1.
This Show that the solution to the system of equations 8x − 5y = 11 and 7x − 8y = 6 is the same as the solution to the given system of equations