Answer:
x=8 y=o
Step-by-step explanation:
If first expression multiples 3 so: -6x-9y=-48 to emerge with second expression
Figure 3
Use substitution method
3a+9=54
3a+9-9=54-9
3a= 45
divide by 3
3a/3= 45/3
a= 15
Answer is a= 15
