Because it's asking cost per gallon, this is a division problem. 28.49 divided by 7.5 = 3.798 or 3.80 rounded.
To give a simple answer
if you consider the equation to be that of a line.
then if the variables cancel out, then the two lines will have the same slope.
two lines with the same slope fall under two categories. Parallel lines, and lines on top of each other
parallel lines have no solutions since the lines never cross each other
lines on top of each other have infinitely many solutions since they "cross" everywhere on the line
38022479-4513258=33,509,221 is your answer
Hope this helps
Let the number be n.
Adding a zero means multiplying the number by 10, 10n.
143-10n=3n, 13n=143 so n=11.
-8x+3y=28
4x-y=-12
<u><em>Step-by-step explanation:</em></u>
Let's find x and y from matrices and then check for this systems.
Simplify, so we got
7-9
28-24
------
So x=-2
y=4
So we need to put those values and check system.