the equation 7+y=13 gives the length of a harlequin beetle and one other insect. if y is the other insect, which insect makes the equation a true sentence?
the reason this is is because if you take 13-7=6 and to get y by itself you take 7+y=13 and subract 7 which gives you the equation y=13-7 so take 13 minus 7 and your answer would be 6.
