Here are two sets of bivariate data with the same response variable. The first contains the variables x & y. The second contains the variables w & y

x y 76 46.2 79.1 80.2 74.4 48.4 79.2 51.5 77 51.5 66.5 96.8 62.8 80.1 64.7 64.8 77.2 70.1 91.4 68.4 72.2 99.9 80.3 60.6 92.3 10.7 74.2 15.7 49.1 85.4 80.8 68 70.7 69.6

w y 53 44.2 54.1 57.1 64.9 62.9 36.1 9.7 63 67.7 41.3 6.5 53.6 35 70.9 47.6 52.4 46.3 67.2 65.2 48.8 46.2 35.9 14.9 33 5.6 85 96.4 46.1 19 56.6 48.6 45.7 26.2

Which explanatory variable has a stronger relationship with the response variable y?