Question

y is partly constant and partly varies as x,when y=-2,x=5 and when y=-1,x=4,find y when x=3 and x when y=1

Answer 1

the slope of the line is ... (-2 - -1) / (5 - 4)
... y = -1 x + b

plug in one of the given points to find b (the y-intercept ... the constant part)

use the equation to find the missing y and x

Answer 2

(4, -1), (5, -2), (3, y), (x, 1).
m = (-2+1)/(5-4) = -1.

-1 = (y+1)/(3-4).
Y = 0.

-1 = (1+1)/(x-4)
X =