Solve each system of equations by substitution
X + 3y = 6
-x + y = -7

Step-by-step explanation:

Given :

..................... equation 1

................... equation 2

solving the system of equation by substitution method , from equation 1 , make x the subject of the formula , that is

........................... equation 3

substitute equation 3 into equation 2 , that is

substitute   into equation 3 to find the value of x , that is

Therefore :

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

x = 3 ± √(5+y)