Answer:
equation: (91 + 89 + x):3 = 95
score needed: x = 105
Step-by-step explanation:
x - the third test score
average of three it's a sum of the three divided by 3:
(91 + 89 + x):3 = 95
×3 ×3
180 + x = 285
-180 - 180
x = 105
Answer: x = -5 (rewritten: x + 5 = 0)
Step-by-step explanation:
First, we must take into account that the line is parallel to the y-axis. If a line is parallel to the y-axis, it is vertical, meaning that for every y-value, there can only be one x-value. Since the question contains a point that the line passes through, which is (-5, 2), we know that for every y-value of the line, the x-value will always equal -5. Thus, the equation of the line must be x = -5 (or, rewritten, x + 5 = 0).
Answer:
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Proportional Relationships
A proportional relationship is one in which two quantities vary directly with each other. We say the variable y varies directly as x if:
y=kx
for some constant k , called the constant of proportionality .
(Some textbooks describe a proportional relationship by saying that " y varies proportionally with x " or that " y is directly proportional to x .")
This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
The graph of the proportional relationship equation is a straight line through the origin.
Straight line adds up to 180
Triangle adds to 180
180-150=30
103+30=133
180-133=47
X=47°
You get everything you need from factoring the last expression:
The left side is a difference of squares, and we get another difference of squares upon factoring. We end up with
Plug in everything you know and solve for 
:
