Question

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)

Answer 1

Find out the determinant

we have

2x-y=4

3x+y=1

so

D=(2)(1)-(-1)(3)

D=2+3

D=5

therefore

the answer is the second option

Verify

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