if y varies directly with x then y = kx where k is a constant find k by plugging in the given values of y and x when y = 3 , x = 2 3 = k * 2 can you find k?
divide both sides of the equation by 2 to find k right
@cwrw238 so the answers D right?
so now we have |dw:1366501494754:dw|
can u see what i've done i've substituted 3/2 for k now to find y when x = 3 plug in 3 for x and work out the value of y
if y varies directly by x y = kx and k = y/x
@cwrw238 i dont understand the 2nd problem
now plug in the values of x and y y = -3 and x = 1 k = -3 / 1 = -3 y = -9 and x = 3 k = -9/3 = -3 also k = -15 / 5 = -3 so is this varying direct;y?
these values of y and x do satisfy the relation y = kx which is direct variation do you see that?
k - -3 in all 3 cases
@cwrw238 ohhhh okay so the answer would be A?
right there are 2 types of variation direct where y = kx and indirect where y = k / x