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stepladder [879]
2 years ago
13

X=y-1 X+2y=8 Solve each system by substituation

Mathematics
2 answers:
DochEvi [55]2 years ago
4 0
Since the first equation is already set up as x= use it to plug into the second equation.
x + 2y = 8
(y -1) + 2y = 8
y -1 + 2y = 8
3y -1 = 8
Add 1 to both sides
3y = 9
Divide both sides by 3
y = 3
Use x = y - 1 to solve for x
x = 3 - 1
x = 2
(2,3)
Bezzdna [24]2 years ago
3 0
The answer is
y=3
x=2

Also, substitution is just a type of method to solve for x and y.
Tell me if you want the steps for solving it
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- ( x - 1 ) = -4x - 2
7nadin3 [17]

Answer:

x=-1

Step-by-step explanation:

1. Remove the parenthesis

   -x + 1 = -4x - 2

2. Get x alone

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  +1x        +1x

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3 0
3 years ago
Triangle EFG is an isosceles triangle with EG=EF. What is the approximate length of EF, and what is the approximate perimeter of
sineoko [7]

Answer:

B. The approximate length of EF is 4.47 units, and the approximate perimeter of triangle EFG is 12.94 units.

Step-by-step explanation:

First step is to determine the length of EF, since that will give us 2 sides of the triangle (since EG = EF).

From the diagram, we can easily make a rectangle triangle by dropping a vertical line from vertex E, let's name Z the meeting point of that line with the segment GF.  Then we have a rectangle triangle EZF with a height of 4 and a base of 2, of which EF is the hypotenuse. So...

EF² = 4² + 2² = 16 + 4 = 20

EF = √20 = 4.47

Now that we have EF, we also have EG:

EF = 4.47

EG = 4.47

GF = 4 (visible on the graph)

Perimeter = 4.47 + 4.47 + 4 = 12.94 units.

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2 years ago
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