SOLUTION: Solve for y: {dx + cy = f {gx + hy = j I got a result of y = (gf - dj)/(gc - dh) Use the results of the problem above to solve for y : {9x + y = 6

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Question 1026582: Solve for y: {dx + cy = f
{gx + hy = j
I got a result of y = (gf - dj)/(gc - dh)
Use the results of the problem above to solve for y : {9x + y = 6
{ x + y = 10
??? I don't understand how to get the answer. Please help!
Answer by ikleyn(52794) (Show Source):
You can put this solution on YOUR website!
.

It is on the Cramer's rule. Read these lesson and become an expert in that issue. - Determinant of a 2x2-matrix - HOW TO solve system of linear equations in two unknowns using determinant (Cramer's rule) - Solving systems of linear equations in two unknowns using the Cramer's rule