Assume y varies directly as x. if y=8 when x=42; find y when x=126

Varies directly basically means a multiple of

y = kx

where "k" is the constant of variation. You must solve for this first using the given information.

8 = 42k

8/42 = k

0.19 = k

Equation: y = 0.19x

when x = 126

y = 0.19 (126)

y = 24