Justin weighed 8lb 12 oz when he was born. at his two week check up he had gained 8 ounces. what was his weight in pounds in ounces?

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

What number should be added to both sides of the equation to complete this square? x^2-10x=7

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5