Answer:
X=2,Y=7
Step-by-step explanation:
Y-3x=1
Make Y the subject
Y=1+3x
Sub into equation 2
2(1+3x)-x=12
Open the bracket
2+6x-x=12
2+5x=12
CLT
5x=12-2
5x=10
Divide both sides by 2
X=2
Sub x=2 in equation 1
Y-3(2)=1
Y-6=1
Y=1+6
Y=7
