Which expression represents the sum of (2x-5y) and (x+y)
1 answer:
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Answer:
x= 3
y=2
Step-by-step explanation:
-3x + 9y = 9 ----------- equation 1
3x + 2y = 13--------------- equation 2
In Matrix Form
Let A = X =
and B =
Then Mathematically AX= B
or X= A⁻¹ B
Where A⁻¹ = Adjacent A/ mod of A
Adjacent A =
Mod Of A= -6 - (27) = -33 which is not equal to zero
so Putting These values in the given formula
X= 1/-33
Now Multiplying Rows and Columns
= -1/33
Solving the Matrix we get
= -1/33
= -1/33
From Here we find x= 99/33 or 3
and y = 66/33= 2