the value of y varies directly with x, and y = 20 when x = -4. what is y when x = -8? y = ? remember: y = kx
the value of y varies directly with x, and y = 20 when x = -4. what is y when x = -8? y = ? remember: y = kx
Answer
Explanation:
Step1: Find the constant of variation ( k )
Given ( y = kx ), substitute ( y = 20 ) and ( x=-4 ). ( 20=k\times(-4) ), so ( k=\frac{20}{-4}=-5 ).
Step2: Find ( y ) when ( x = -8 )
Use the equation ( y = kx ) with ( k=-5 ) and ( x=-8 ). ( y=-5\times(-8)=40 ).
Answer:
( 40 )