This isosceles triangle has two sides of equal length, [tex]a[/tex], that are longer than the length of the base, [tex]b[/tex]. The perimeter of the triangle is 15.7 centimeters. The equation [tex]2a + b = 15.7[/tex] models this information.
If one of the longer sides is equal to [tex]x[/tex], what equation can be used to find [tex]x[/tex]?