How do you find slope between two points

What value of x will make the triangles similar by the sss similarity theorem?

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

Find an equation for the linear function which has slope -10 and x-intercept -7