Unit 5  Objective 5  Solving 2 Equations in 2 Unknowns by
Determinants
Another method to solve 2 equations in 2 unknowns is by
using determinants:
If a, b, c, and d are any four real numbers, then the symbol
is called a 2 x 2 determinant. The numbers a, b, c, and d are called the elements of the determinant. The value of a determinant is called the number ad  cb so
We can use Cramer's rule to solve two linear equations in 2 unknowns. If we have
a_{1}x + b_{1}y = c_{1}
a_{2}x + b_{2}y = c_{2}
then
Examples: Solve the following using Cramer s Rule

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