Question 301979
Linear function : y = mx + c where m = -4 and c = ? 

Put the point (1,-2) and m = -4 into y = m*x + c to solve for c

-2 = (-4)(1) + c 
-2 = -4 + c
-2 + 4 = c
c = 2 

Therefore, the linear function becomes : y = -4x + 2