Which equation has solution x = -3?
1 answer:
Your question: Which equation has solution x = -3?
I'd like you to know: I couldn't find any answer that exactly answered X=-3, although there is an answer similar to. But if it was accidental, this would be the most <em>correct </em>answer.
Answer: A) 2x - 7 = -1
|Step-by-step explanation|
- 2x - 7 = -1 = x=3
- 3x + 8 = 1 = x=-7/3
- x + 8 = 10 = x=2
- 11 (2x-6) = -6 = x=30/11
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Answer:
64
Step-by-step explanation:
Important angle relationships that will help us answer this question :
- Supplementary angles : Supplemtary angles are angles that for a straight line. The sum of these angles is 180 degrees.
- Corresponding angles : corresponding angles are angles that are on the same side of the traversal as well as the same side of the intersecting lines. These angles are congruent ( equal to each other ) if the two lines that they fall on are parallel ( which they are )
- Opposite exterior angles - These angles are angles on the very outside of the lines and are on opposite sides of the transversal. These angles are congruent as well
For more clarification kindly view the attached images :)
Using these angles relationships, we can easily find the answer two different ways.
First way :
Creating an equation : We want to find the measure of angle MPN. It's important to note that this angle falls on a line made up of other angles ( angle mpe and angle npe ) forming a straight line ( line e )
Using our angle relationships we know that angles that form a straight line are supplementary and add up to 180 degrees.
So we can say angle mpe + angle npe + angle MPN = 180. ( we can use this equation to solve for angle MPN )
Here we are given that angle mpe is a right angle ( indicated by the little square ) meaning it has a measure of 90 degrees.
So we can further simplify our equation saying that angle npe + 90 + angle MPN = 180 ( by plugging in angle mpe = 90 )
Now if you didn't know we can solve an equation ( find the missing angle ) if there is a single variable ( in this case we want the variable to be angle MPN ). This means that in order to solve for angle MPN we just find the measure of the other angle, angle npe.
Finding angle npe
The angle under "x" is corresponding to angle mpE so we can say the angle under x = angle npe.
The angle under x also appears to be supplementary to the angle with a measure of 153 degrees. So we can say that angle under x + 154 = 180
Subtracting both sides by 153 we get that angle under x = 180 - 154 = 26 degrees.
Because the angle under x and angle npe are corresponding and equal to each other, angle npe also has a measure of 26 degrees.
Finishing creating the equation and solving for angle MPN : So we have angle npe + angle mpe + angle MPN = 180
We know angle mpe = 90 and angle npe = 26
So we can say 90 + 26 + angle MPN = 180
Now we can solve for angle MPN
90 + 26 + angle MPN = 180
==> combine like terms
116 + angle MPN = 180
==> subtract 116 from both sides
angle MPN = 64 degrees
Second way :
We can also solve for angle MPN using the angle relationship " opposite interior angles "
The angle with a measure of 154 degrees and angle ePN are opposite exterior angles meaning they are congruent. ( so angle ePN = 154 )
Angle ePN is made up of angle mpe and angle MPN. This means that angle mpe + angle MPN = 154
We've already identified that angle mpe = 90 degrees because it's a right angle so we can say angle angle MPN + 90 = 154
Subtracting both sides by 90 we get that angle MPN = 154 - 90 = 64 degrees
And we are done!
