In a coordinate plane , triangle ABC has vertices A (1, 1), B (1,5) and C (5,1). Triangle ABC is dilated by a scale factor of 2 with the origin as the center of dilation, resulting in triangle A'B'C'. What is the length, in units of _ A'B'?
A.) 2
B.) 4
C.) 6
D.) 8

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

good luck on your studies! : )

david edward.

16

step-by-step explanation: