Pls help 7th grade math

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square