According to the question, the line is through the points
and 
To calculate the slope using standard formula that is :

Now the slope equation will be: 

The slope-intercept form is:
What is the equation of the line?
To represent the set of points in an algebraic form is known as the equation of line. The set of points represent lines in the coordinate system. The parameters can be calculated and those parameters are slope and y-intercept.
To learn more about the equation of the line from the given link:
<u>brainly.com/question/14037984</u>
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If you turn the ratio 1:3 into a fraction it would be 1 over 3 I hope this helps
If you work out the equation the answer would be 5 but its not a definite answer.
Make the equations equal to each other to find x.
21.2x+c=5.3(4x-4.6)
Now distribute.
21.2x+c=21.2x-24.38
So c= -24.38