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stepladder [879]
3 years ago
14

Solve, using linear combination. 3x + y = 4. 2x + y = 5. A.. . . (–1, 7). . . B.. . . (–3, 12). . . C.. (0, 4). . . D.. . . (–3,

13).
Mathematics
2 answers:
Nady [450]3 years ago
8 0
3x + y = 4....multiply by -1
2x + y = 5
--------------
-3x - y = -4 (result of multiplying by -1)
2x + y = 5
--------------add
-x = 1
x = -1

2x + y = 5
2(-1) + y = 5
-2 + y = 5
y = 5 + 2
y = 7

solution is (-1,7)
Kisachek [45]3 years ago
5 0
3x + y = 4
2x + y = 5
-3x - y = -4 
2x + y = 5
-x = 1
x = -1
2x + y = 5
2(-1) + y = 5
-2 + y = 5
y = 5 + 2
y = 7

solution is (-1,7) hope this helps 
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What is the domain of the function represented by the following graph?
Svetllana [295]

Hello!

The domain of the function are the x-values that make the function true.

Since the graph has open circles and filled in circles, the open circles make the function false (written as <) , and the filled in circles make it true (written as ≤).

From the graph, the x value -3, and 2 are open circles. While the value -0.5 are filled in circles. Also, from the interval (-0.5, 2), there is gap, so it is part of the domain.

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6 0
3 years ago
A trapezoid has a height of 12 feet,
Dmitry_Shevchenko [17]

▬▬▬▬▬▬▬▬▬▬▬▬▬▬

<h3>Given : </h3>

→ Base = 15 and 10

→ Height = 12

<h3>To Find :</h3>

→ Area of trapezoid

<h3>Solution :</h3>

→ Area of Trapezoid = (a + b)/2 × h

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