Respuesta :
Using standard linear equation, y = m*x + c
where m = slope and c = constant
putting ordered pairs, (3,7000) and (4,5000) in the above equation, we get two equations
3*m + c = 7000 and 4*m + c = 5000
On solving,
m = -2000 and c = 13000
So, the required equation is
y = -2000*x + 13000