Answer:
1
Step-by-step explanation:
If there isn't a number in front of a variable then always assume is is one.
For example, look at this equation:
x + 3y = 16
See how there is no number in front of the x?
It can't be 0 in front of the x because 0 times anything is zero, right?
Therefore, it has to be a one.
So, the equation above could be written like this:
1x + 3y = 16
In mathematics it is just automatically assumed that if a term doesn't have a number in front of the variable, then the coefficient of that term is 1.
<em>I hope this helps!</em>
<em>If you have any questions let me know!</em>
<em>- Kay :)</em>
