Answer: x = 2
Step-by-step explanation:

Replace y in the first equation by the value of y in the second equation.

the answer is 63 because 63*2=126 and 126+54=180 and all triangles add up to 180
It is true because the y and x will always be the same number and a vertical line has no slope thus equaling 0,0
The domain of a function f(x) is a set of all values for which the function is defined. The range of is a set of all values that f takes.