Question

The pair of equations 3x – 5y = 7                                                    8x + 10y = 7​

Answer 1

Answer:

Use the bcab rule

        b        c       a       b

1       -5       -7      3      -5

2      10       -7      8      10

    $\frac{x}{b_1c_2-b_2c_1} =\frac{y}{c_1a_2-c_2a_1} =\frac{1}{a_1b_2-a_2b_1}$  (plug in the values and simplify yourself)

⇒  $\frac{x}{105} =\frac{y}{-35} =\frac{1}{70}$

Now let us equate the x variable side to the constant side.

$\frac{x}{105} =\frac{1}{70}$

$x=1.5$

Now let us equate the x variable side to the constant side.

$\frac{y}{-35} =\frac{1}{70}$

$y=-0.5$

Answer 2

Answer:

I don't know this language