Question

Y=2x y=7x + 15 substitution

Answer 1

$y = 2x \\ y = 7x + 15$

Substitute the given value of y into the equation y=7x+15

$2x = 7x + 15$

Move the variable to the left-hand side and change its sign

$2x - 7x = 15$

Collect like terms

$- 5x = 15$

Divide both sides of the equation by -5

$x = - 3$

Substitute the given value of x into the equation y=2x

$y = 2 \times ( - 3)$

Solve the equation for y

$y = - 6$

The possible solution of the system is the ordered pair (x,y)

$(x,y) = ( - 3, - 6)$

Answer 2

Answer:

y = -6 and x = -3

Step-by-step explanation:

 Data :

Eq 1 : y = 2x

Eq 2 : y = 7x + 15

So

  Take eq 1 and solve for x

  ⇒  x = y/2        eq 3

Put eq 3 in eq 2

 y =7 (y/2) +  15

   y - 7y/2 = 15

    ( 2y-7y )/2 = 15

   -5y/2 = 15

  -5y =30

y = -6

And  put value of y in eq 3 to find x

  x = -6/2

  x =-3