Slope-intercept form is y = mx + b. all you have to do for this question is plug your given information in:
m = -3
b = 7
y = mx + b
y = -3x + 7
3(13-2a)=-3+a
39-6a=-3+a
42=7a
a=6
okay honey just divide 364 by 26 which is 14
i believe this is the answer
hope i helped.
The solution for the x-value in this set is -7≤x