diff --git a/exercises/_07-ex-model-slr.qmd b/exercises/_07-ex-model-slr.qmd
index fdc4f25b..2b6de6b2 100644
--- a/exercises/_07-ex-model-slr.qmd
+++ b/exercises/_07-ex-model-slr.qmd
@@ -11,15 +11,15 @@ The scatterplots shown below each have a superimposed regression line. If we wer
     df <- tibble(
       x = seq(1, 100, 1),
       y_linear = 3 * x + 5 + rnorm(length(x), mean = 0, sd = 20),
-      y_fan_back = 4 * x + 5 + rnorm(length(x), mean = 0, sd = sort(1.3 * x,     decreasing = TRUE))
-    ) |
+      y_fan_back = 4 * x + 5 + rnorm(length(x), mean = 0, sd = sort(1.3 * x, decreasing = TRUE))
+    ) |>
       pivot_longer(cols = -x, names_to = "type", values_to = "y") |>
       arrange(type) |>
       mutate(type_label = if_else(type == "y_linear", "(a)", "(b)"))
     
     ggplot(df, aes(x = x, y = y)) +
       geom_point(size = 2, alpha = 0.8) +
-      geom_smooth(method = "lm", se = FALSE, color = "black", size = 0.8) +
+      geom_smooth(method = "lm", se = FALSE, color = "black", linewidth = 0.8) +
       facet_wrap(~type_label) +
       theme(axis.text = element_blank()) +
       labs(x = NULL, y = NULL)