Solve the system by finding the determinants and using Cramer's Rule:2x - y = 43x + y = 1D= 10, Dx = 10, Dy=-20Answer: (1, -2)D = 5, Dx = 5, Dy = -10Answer: (1, -2)D= -2, Dx = -2, Dy = 4Answer: (1, -2)D = 14, Dx = 28, Dy = 0Answer: (2,0)
1 answer:
Find out the determinant
we have
2x-y=4
3x+y=1
so
D=(2)(1)-(-1)(3)
D=2+3
D=5
therefore
<h2>the answer is the second option</h2><h2>Verify</h2>
solution (1,-2)
equation 1 -------> 2(1)-(-2)=4 -------> 4=4 is true -----> is ok
equation 2 ------> 3(1)-2=1 -----> 1=1 ----> is true -----> is ok
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