I've done everything I can, I cant figure this out pls help asap

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

What does x = in this equation x+3+2x=x+5

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.