System AAA \text{\quad}start text, end text System BBB \begin{cases}4x+16y=12x+2y=-9\end{c ases} ⎩ ⎪ ⎪ ⎨ ⎪ ⎪ ⎧ 4x+16y=12 x+2y=−9 \begin{cases}4x+16y=12x+4y=3\end{ca ses} ⎩ ⎪ ⎪ ⎨ ⎪ ⎪ ⎧ 4x+16y=12 x+4y=3 1) How can we get System BBB from System AAA?

Replace one equation with a multiple of the other equation.

Are the equations equivalent? No.

Step-by-step explanation:

Khan academy answer

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yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

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.