Question

Solve each pair of simultaneous equations by substitution method

Answer 1

Answer:

x = 1 and y = -4

Step-by-step explanation:

Let's substitute y = -4x into x + 3y = -11

x + 3(-4x) = -11

x - 12x = -11

-11x = -11

/-11     /-11

---------------

x = 1

You can plug x = 1 into either of the given equations. Let's do x + 3y = -11

1 + 3y = -11

-1           -1

-----------------

3y = -12

/3      /3

-----------------

y = -4

Your values are, x = 1 and y = -4.

Answer 2

Answer:

x = 1       y = -4

Step-by-step explanation:

- Plug the value of y into the other equation.

x + 3y = -11

x + 3(-4x) = -11

x - 12x = -11

-11x = -11

x = 1

- Now substitute the value of x into any equation.

y = -4x

y = -4(1)

y = -4