Question

5x+3y= -11 , 2x+4y= -10
slove Crammer's Method.​

Answer 1

Step-by-step explanation:

I got:

x=3

y=−4

Explanation:

We can try using Cramer's Method:

1) evaluate the determinant of the matrix A formed with the coefficients of the unknowns:

∣∣∣532−6∣∣∣=(−30−6)=−36

2) evaluate the determinant of the matrix Ax formed with the first column of independent terms and the other with the coefficients of the unknowns:

∣∣∣3330−6∣∣∣=(−18−90)=−108

3) find x by dividing:

AxA=−108−36=3

4) evaluate the determinant of the matrix Ay formed with the second column of independent terms and the other with the coefficients of the unknowns:

∣∣∣53230∣∣∣=(150−6)=144

5) find x by dividing:

AyA=144−36=−4