Answer:
No solution
Step-by-step explanation:
3 x + y = 4 (1)
− 3 x − y = − 8 (2)
Add (1) and (2)
0 + 0 = -4
0 = -4 is a false statement
So, no solution
Answer:
1
Step-by-step explanation:
5/5=1
Answer:
18
Step-by-step explanation:
90% of 20 is 18
Line 1 and Line 4 are parallel lines
Solution:
General equation of a line:
y = mx + c
where m is the slope and c is the y-intercept of the line.
<u>To find the slope of each line:</u>
Line 1: 
Slope 
Line 2: 

Add 7 on both sides, we get

Slope 
Line 3: 
Slope 
Line 4: 
Subtract x from both sides, we get

Multiply by
on both sides, we get

Slope 
<em>Two lines are parallel, if their slopes are equal.</em>
From the above slopes,

Therefore Line 1 and Line 4 are parallel lines.