No I think it is the opposite. Hope this helps.
The equation has the form Y= a + bX,
Where:
Y is the dependent variable (that's the variable that goes on the Y axis).
X is the independent variable (i.e. it is plotted on the X axis).
b is the slope of the line.
a is the y-intercept.
For number 6 I know the answer is 34 beacuse you add 6, 13, and 15 together to get 34.