1) If y=4 when x= -2, find x when y= -52) If y=20 when y= -5, find x when y= -1Use direction variation formula

1) x = 2.5 when y = -5 2) x = 0.25 when y = - 1 Solution:Given that , we have to use direction variation formula. Now, we know that, direct variation formula is y = kx, where k is proportionality constant. 1) If y=4 when x= -2, find x when y= -5  Put y = 4 and x = -2 in y = kx  4 = k(-2)  k = - 2 Then, when y = -5  -5 = (- 2)x   x = 5/2  x = 2.5 2) If y=20 when x = -5, find x when y= -1 Put y = 20 and x = -5 in y = kx  20 = k(-5)  k = - 4 Then, when y = -1  -1 = (- 4)x   x = 1/4  x = 0.25 Hence, 1) x = 2.5 when y = -5 and 2) x = 0.25 when y = - 1