Book Maths Puzzle Algebra

4x-y=-27 graph it

Read Solution (Total 0)

Book Other Question

2/x^2-1=2/x

I have a few more I need help on. Seeing the steps would help me figure out where I am going wrong.

n=81jk^2 for k

solve the next one by completing the square
Can you please explain to me how you find the answer to this problem: If two parallel sides of a square are increased by 6 cm and the other two parallel sides are each decreased by 1 cm, a rectangle is formed having twice the area of the square. How long was each side of the square?