A 4-column table with 3 rows. Column 1 is labeled Adults. Column 2 is labeled Children. Column 3 is labeled Total People. Column
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You can see from the table that the y coordinate is always obtained by doubling the x coordinate and switching its sign. So, the relation is
To invert this function, we must solve for y. Simply divide both sides by -2 and we have
Rename the variables to get