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pav-90 [236]
3 years ago
11

Which could be the first step in solving this system of equations by substitution?

Mathematics
1 answer:
Ainat [17]3 years ago
3 0

Answer:

The first step is to replace the y in y-x=15 with 7x (we can do this because the first equation tells us that they're equal)

solve and get

(2.5,17.5)

or x= 2.5 y=17.5

Step-by-step explanation:

The first step is to recognize that y=7x which means that we can just replace the y in the second equation with 7x

7x-x=15

6x=15

x=2.5

Then we can solve for y

y=7(2.5)

y=17.5

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ASA but I’m not sure
3 0
3 years ago
Two congruent solids S1 and S2 have the property that S1∩S2 is a right triangular prism with height 3 and a base that is an equi
erastova [34]

Answer:

S1=9.905 cubic units

Step-by-step explanation:

As the two solids are congruent it can be said that they have the same angles and the same lengths then their volume is equal and therefore S1= S2 then S1∪S2= S1+S2- S1∩S2 = S1+S1- S1∩S2 =2S1- S1∩S2 =25.

Now, S1∩ S2= Prism volume= (Area of triangle (A)*Height(h)), the area of the equilateral triangle that is the base of the prism is given by A=√3/4*(length Lateral) ^2= A=√3/4*(2^2 )=√3 square units .

Then S1∩ S2=A*h =√3*3=5. 19 cubic units .

Finally you have

2S1- S1∩S2 =25

2S1-5. 19=25 clearing s1 you have

S1=(25-5. 19)/2 = 9. 905 cubic units

5 0
3 years ago
Two less than three times the width of a rectangle is equal to the lenght.The area of the rectangle is 65 square ft.What is the
3241004551 [841]

Answer:

 length:  13 feet

Step-by-step explanation:

width:  x

length:  3x - 2

Area = Length * Width

65 = x(3x - 2)

65 = 3x² - 2x

3x² - 2x - 65 = 0

(3x +  13)( x -  5) = 0

3x + 13 = 0       and     x - 5 = 0

3x = -13                             x = 5

x = - 13/3

**Width cannot be a negative number so we'll discard -13/3.

width:  x = 5

length:  3x - 2 = 3(5) - 2 = 13

7 0
3 years ago
What is the “mean” of this number sequence? 4, 2, 2, 2, 5, 15
Debora [2.8K]
The mean is found by dividing the sum of all terms by the number of terms present in the set.

Set up the equation:

\frac{2 + 2 + 2 + 4 +5 + 15}{6} = \frac{30}{6} = 5

The mean of this sequence is 5.

4 0
3 years ago
Read 2 more answers
I need help asap please ​
dsp73

Answer:

its correct

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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