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jennamay31
Suppose y varies directly with x, and y = 10 when x = –3. What direct variation equation relates x and y? What is the value of y when x = –1?
There is two ways to do this: 1) y1/x1=y2/x2 10/-3= y/-1 10(-1)=y(-3) -10=-3y y=10/3 2) y=kx 10=k (-3) k=10/-3 y=kx y=-10/3 (-1) y=10/3
direct variation is of the form y = x ; not y= x+b