What is the first step to solve the following system of equations using substitution?I'm x−y=72 x−y=17

1. Solve the first equation for x.
2.Divide the second equation by 2.
3.Multiply the first equation by 2.
4.Add the two equations together.

Arectangle with an area of 47 m² is dilated by a factor of 7. what is the area of the dilated rectangle? enter your answer in the box. do not leave your answer as a fraction.

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.

Asap! i'm not good math and i'm lost.