Y=-3x

y=6x-9 in substitution method

Hi

y = - 3x

y = 6x-9 ⇒

y = 6x-9 ⇒ - 3x = 6x-9 ⇒ - 3x-6x = - 9 ⇒ - 9x = - 9 ⇒ x = - 9/-9 ⇒ x = 1

y = - 3x

y = - 3 (1)

y = - 3

Answer: x = 1 and y = - 3

The two equations given in the question are

y = - 3x

And

y = 6x - 9

Let us now substitute the value of y from the first equation to the second equation, we get

y = 6x - 9

- 3x = 6x - 9

-3x - 6x = - 9

- 9x = - 9

Multiplying both sides of the equation by - 1 we get

9x = 9

x = 9/9

= 1

Now let us put the value of x in the first equation, we get

y = - 3x

= - (3 * 1)

= - 3