To solve the system of equations below, Chen isolated x^2 in the first equation and then substituted it into the second equation. what was the resulting equation?

its the fourth option

i think it might be a but you might want a second opinion

what is the missing angle?

  d. △abc is congruent to △fde

step-by-step explanation:

triangle abc is reflected across the x-axis. the corresponding vertices are

the names of the triangles in the congruence statement must have corresponding vertices in the same order. that is, △abc is congruent to △fde.