Question

ayudenme porfa es urgente
3x-4y=7
2x+3y=-1
con el metodo de Cramer

Answer 1

Respuesta:

           x     y

            |      |

M =  $\left[\begin{array}{ccc}3&-4\\2&3\\\end{array}\right]$ → | M | = (3)(3) - (-4)(2)

                            | M | = 9 + 8 = 17

$M_{x}$ = $\left[\begin{array}{ccc}7&-4\\-1&3\\\end{array}\right]$ → | $M_{x}$ | = (7)(3) - (-4)(-1)

                               | $M_{x}$ | = 21 - 4 = 17

$M_{y}$ = $\left[\begin{array}{ccc}3&7\\2&-1\\\end{array}\right]$ → | $M_{y}$ | = (3)(-1) - (7)(2)

                            | $M_{y}$ | = -3 - 14 = -17

y = $\frac{|M_{y}| }{|M|}$  = $\frac{-17}{17}$ = -1

x = $\frac{|M_{x}| }{|M|}$ = $\frac{17}{17}$ = 1

| y = -1 |

| x = 1 |