In quadrilateral badc, ab= ad and bc= dc. the line ac is a line of symmetry for this quadrilateral. based on the line of symmetry, explain why the angles acb and acd have the same measure

See explanation

Step-by-step explanation:

In quadrilateral BADC,

AB= AD

BC= DC

AC is a line of symmetry for this quadrilateral

Consider triangles BAC and DAC. In these triangles,

So, ΔBAC ≅ ΔDAC by SSS postulate.

Congruent triangles have congruent corresponding sides and angles, so

m∠ACB = m∠ACD

Another way: The line of symmetry can be defined as the line that divides the figure into two identical figures. Thus, ΔBAC and ΔDAC are identical (congruent) and have congruent corresponding sides and angles.

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)