Hey there!!
What is slope-intercept form ?
Ans :- y = mx + b
Where ' m ' is the slope and ' b ' is the y-intercept.
Equation given :- y = kx + 2
Now, we know k is m or the slope and 2 y-intercept.
y-intercept can be given as a coordinate.
Hence, y - intercept 2 can be written as ( 0 , 2 )
Now we have 2 coordinates, ( 0 , 2 ) and ( -7 , 12 )
How do we find slopes ?
Ans :- Slope = 
Plugging in the values :
Slope = 
Slope = 
Hence, the value of 'k' is 
Hope my answer helps!
The answer to what question?
Ax + by = C Is that what you need?
Let his original money is x
So,

+

+ 2.25 = x
or,

or, 5x + 13.5 = 6x
or, x = 13.5
So, he had $13.5 originaly.
Thanks!
Answer:
n = -2
Step-by-step explanation:
21 = -5x + 11
10 = -5x
n = -2