ggplot2 - How do I remove a specific row in ggplot in r when working with y element of ggplot()? (Explanation better below)

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Currently graphing the below scatterplot and I have a "null" category on the x-axis. I have used which for NumofBed to remove the rows with "null" in them, but how do I remove this category from the sales_price y? (I'm getting the error that my x and y numbers don't match up because sales_price is including the rows where NumofBed is null).

scatterBedValue <- ggplot(housedata, aes(x=which(NumofBed != "null"), y=sales_price)) 

Graph below is using scatterBedValue <- ggplot(housedata, aes(x=NumofBed, y=sales_price))

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