Two equations, two unknowns

The equations are $\displaystyle 2x+3y=4$ and $\displaystyle 5x+6y=7$. Press , , . Type the coefficients in order, each followed by ENTER: 2, , 3, , 4, . Then enter the second equation: 5, , 6, , and 7. A last solves: X: −1. Y: 2. D: −3.. $\displaystyle D$ is the determinant of the coefficients. If it is zero, an error occurs.

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