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Svetlanka [38]
4 years ago
7

Systems of equations using linear combinations/elimination

Mathematics
1 answer:
valina [46]4 years ago
6 0
The answer is B
2x+5y=3(1) times it by 1
-x+3y=-7(2) times it by 2
____________________
2x+5y=3
-2x+6y=-14
__________
11y=-11
Y=-1

Now we have to found x..... you have to plug in -1 in 2x+5y=3...

2x+5(-1)=3
2x-5=3
2x=3+5
2x=8
X=8/2
X=4

There are your 2 solutions... hope you understand

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Use prime factorization to find gcf of 57 and 27
Vadim26 [7]
Gcf (57,27) = <span><span><span>57×27/</span><span>lcm(57,27)</span></span>=<span>1539/513</span></span> = 3
4 0
4 years ago
Someone please help me
hichkok12 [17]

Answer:

364.8 ft^2.

Step-by-step explanation:

I  assume you want the area of the figure.

Total area = area of the top triangle + area of the trapezium

= 1/2 * base * height + 1/2 * height * ( sum of the parallel sides)

= 1/2 * 18 * 6 + (14/2)( 18 + 26.4)

=  54 + 310.8

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3 0
3 years ago
Find the coordinates of the points of intersection of the graphs with coordinate axes: y=− 1/4 x+2
bearhunter [10]

Answer:


Step-by-step explanation:

Here, you can use a simple formula.

To find the point of intersection you just put x=0 or y=0.

Because, if a graph intersects x-axis, then at this point  y=0

Similarly, if a graph intersects y-axis, then at this point  x=0


So, for our given line.

y=-1/4 x +2

when , x=0 , y=-1/4 (0)+2=2

So, the graph intersects y-axis at   y=2


when , y=0 ,

then    0=-1/4 x+2

       or, 1/4 x=2

       or, x=8    [multiplying by  4]

So, the graph intersects x-axis at   x=8

3 0
4 years ago
What are the roots of the equation 4x2 = 36x – 87 in simplest a + bi form?
sammy [17]

Answer:

x = 87/28

Step-by-step explanation:

6 0
3 years ago
I'm very confused on how to do this​
PilotLPTM [1.2K]
The first number in the bracket is the x coordinate, the second is the y
So substitute the x and y in to get
8=-5(3)+1 which is 8=-14 which isnt true so the answer is no
5 0
3 years ago
Read 2 more answers
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