Determine whether the equation defines y as a function of x. (see example 9.) 5x + 4y = 20

Strictly speaking, the equation does NOT define y as a function of x. It defines a relationship that x and y must satisfy. It can be solved for y so that it does define y as a function of x:

... y = (20 -5x)/4

However, if we take as a working definition of a function the notion that it is an equation that yields exactly one value of y for each value of x put into it, then we probably have to say the equation DOES define y as a function of x.

Your choice of answers likely depends on what you see in Example 9.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

idk

step-by-step explanation:

do it yourself, cause that made me do it myself today, in english!