Answer:
In triangle ABC and triangle CDA
AB=CD(given)
BC=DA(given)
AC=AC(common)
Thus triangle ABC and triangle CDA are congruent by SSS rule
Have you found the answer to this??
Is it for the fraction part? to get rid of the fractions just multiply both sides by the denominator.
6=5/2(6)+b
6=15+b
subtract 15 from both sides
b=-9
