Give the linear system 3x + 7y = 20
x - 4y = 9
Identify the values for the elements in the
coefficient matrix.
211 212
A =
121 122
[a
What is the size of the augmented matrix for the linear system?

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

answer:

c) the x-coordinate of the center of the circle increases by 3