If root x+9=root 784, the value of x

The spring the owner of a sporting good store decreases the price of winter gloves from $10 to $8 each increases the price of swimming goggles from $8 to $10 without doing the math you think the percent decrease in the price of the gloves the same as the percent increase of the goggles explain why or why not

What is the value of x in the equation7x+2y=48 when y=3

Write the equation in general quadratic form: plz !