The length of a rectangle is 7cm less than 3 times it's width. It's area is 20 square cm. Find the dimensions of the rectangle

4 cm by 5 cm (4 x 5)

Step-by-step explanation:

The area of a rectangle with length and width is given by . Since the length of the rectangle is 7 less than 3 times its width, we can write the length as . Therefore, substitute into :

Distribute:

Subtract 20 from both sides:

Factor:

Since is extraneous (our dimensions cannot be negative), our answer is . Thus, the length must be and the dimension of the rectangle are 4 cm by 5 cm (4 x 5).

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

im with everythinglos so yeahhhhh

step-by-step explanation: