The length of a rectangle is 3 inches more than its width if the perimeter is 42 inches find the dimensions of the rectangle

put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)