Suppose y varies directly with x. Write a direct variation equation that relates x and y. Then find the value of y when x. y = 9 when x = 4
Write a direct variation equation that relates x and y.

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

X2 + y 2 = 36 x + y = 6 solve the system of equations.

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