No, MANOVA is for Multivariate analysis of variance which is used if there are multiple responses as well as variables but you just have one response which is blood pressure. You should just have model <- lm(BP ~Weight+Height) anova(model) If Weight is related to Height only one should be significant so you can drop it from the model and then use anova again to compare the two models. The collinearity between Weight and Height is really a separate question and shouldn't be a problem when fitting a model for BP.
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