X1 = 0
X2 = 1
X3 = 7
I hope that helps!! :)
<em>Look at the attached picture⤴</em>
<em>Look at the attached picture⤴Hope it will help u....:)</em>
Answer:

Step-by-step explanation:
Let
x------> The money each friend must pay, including the tip
we know that

so


Answer:
a = 2 
Step-by-step explanation:
Given
a = 
Multiply both sides by 9 ( the LCM of 3 and 9 ) to clear the fractions
3a = 7 ( divide both sides by 3 )
a =
= 2 