Step 1: Problem
x - y = -4 --------------------------- 1
5x - y = 8 --------------------------- 2
Step 2: Concept
Use substitution method
Step 3: Method
Make x subject of formula from equation 1 and substitute in equation 2 to find y.
from equation 1: x - y = -4
x = - 4 = y
substitute x into equation 2.
5x - y = 8
5(-4 + y ) - y = 8
- 20 + 5y - y = 8
5y - y = 8 + 20
4y = 28
y = 28/4
y = 7
from x = - 4 + y
x = - 4 + 7
x = 3
Step 4: Final answer
x = 3 and y = 7
