Answer:
X=-4 Y= 5
Step-by-step explanation:
solving the equation simultaneously
4X+7Y = 19-------------(1)
Y- X = 9-------------(2)
from equation (2),
Y = 9+X ----------------(3)
substituting equation (3) into equation (2)
4X+7(9+X)=19
removing bracket
4X+63+7X= 19
11x = 19-63
11X = -44
X= -44/11
X= -4
put X equal- 4 into equation (3)
Y= 9+-4
Y= 5
therefore, X= -4 Y = 5
therefore,
for the system of linear equation to be true, x must be= -4 and Y = 5
