Question

3x-4y=10 , 4x+3y= 15 by cramer's rules​

Answer 1

Answer:

x= $\frac{18}{5}$

y= $\frac{1}{5}$

Step-by-step explanation:

3x - 4y = 10

4x + 3y = 15

A =$\left[\begin{array}{cc}3&-4\\4&3\\\end{array}\right]$ = 25      A1 = $\left[\begin{array}{cc}10&-4\\15&3\\\end{array}\right]$  = 90  A2 = $\left[\begin{array}{cc}3&10\\4&15\\\end{array}\right]$ = 5

x= $\frac{A1}{A}$= $\frac{90}{25}$ = $\frac{18}{5}$

y= $\frac{A2}{A} = \frac{5}{25} = \frac{1}{5}$