Can someone explain 7 and 8 to me? i really don’t get it that well. on 7, why are they congruent? why is it false for 8?

Step-by-step explanation:

In ΔABD and ΔBDC

  BD = BD  {common to both trianles}

 ∠ABD =∠DBC    {BD is bisects ∠B}

∠BAD =   ∠BCD   {given in the sum, both are 90}

ΔABD and ΔBDC are congruent triangles.

7) so, AD conguent CD

8) False.

AB congruent CB because ΔABD and ΔBDC are congruent as CPCT rule.

AB congruent CB not because of BD is bisector of  ∠B

3x + 4y -25 =0 represents the amount of change sianna should recieve