suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x= 7.
y= -4 when x= 4
equation=
y = kx
To find the value of k, we can use the given data point (x = 4, y = -4):
-4 = k * 4
-4/4 = k
k = -1
Therefore, the direct variation equation that relates x and y is y = -x.
To find the value of y when x = 7, we can substitute x = 7 into the equation:
y = -(7)
y = -7
Therefore, when x = 7, y = -7.