What else would need to be congruent to show that triangle ABC equals triangle DEF by SAS

A. BC congruent to EF

Step-by-step explanation:

A. Side BC is congruent to side EF

Step-by-step explanation:

To prove triangles congruent with SAS, you need two pairs of sides and a pair of angles. The pairs of sides and pair of angles cannot be random. They must be in the order side-angle-side on each triangle. The angle must be formed by the sides you are using.

In the given triangles, you are told sides AC and DF are congruent.

You are also told that angles C and F are congruent.

The only pair of sides that will work with SAS is the pair of sides you need to finish forming angles C and F.

Those sides are BC and EF.

A. Side BC is congruent to side EF

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.