Substitution method-- ? !
what is the x-coordinate of the solution for the system of equations?

y - x = 9
10 + 2x = -2y

enter your answer in the box.

x=

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x