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MaRussiya [10]
3 years ago
12

Help ASAP please need it rn !!!

Mathematics
1 answer:
Leto [7]3 years ago
6 0
I think maybe it’s C???
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Solve the system of equations two ways: 3x+y=5 and x-2y=4 A) using substitution B) using elimination
Vedmedyk [2.9K]
A. solve for 1 variable
let's solve for x in 2nd equation
add 2y to both sides
x=2y+4
sub 2y+4 for x in other equation
3(2y+4)+y=5
6y+12+y=5
7y+12=5
minu12 both sides
7y=-7
divide 7
y=-1
sub back
x=2y+4
x=2(-1)+4
x=-2+4
x=2
(2,-1)


B. eliminate
eliminate y's
multiply first equation by 2 and add to first

6x+2y=10
<u>x-2y=4 +</u>
7x+0y=14

7x=14
divide by 7
x=2
sub back
x-2y=4
2-2y=4
minus 2
-2y=2
divide -2
y=-1
(2,-1)



(2,-1) is answer
5 0
3 years ago
Given klmn is a trapezoid, kl = mn, m&lt;1 = m&lt;2, lm/kn = 8/9, pklmn = 132. Find: the length of the legs
Ilia_Sergeevich [38]

Answer:

The length of legs lm, mn, and lk is 32 while that of kn is 36.

Step-by-step explanation:

The diagram is attached in the answer.

As both the angles are equal thus the two forms isosceles triangles. This is true because the converse of base angle theorem is applicable here. The theorem clearly states that when a trapezoid is divided by the diagonal, it forms two set of angles where m<1=m<2 and m<lmk=m<nmk

This leads the two set of legs such as

\dfrac{lm}{kn}=\dfrac{8}{9}

Or this could be written as

lm=8x\\kn=9x

Now the remaining two sides are given as

lk=lm as this form an isosceles triangle so

lk=8x

Similarly

mn=lm\\

Or

mn=8x

Now the perimeter is given as

\text{perimeter}=lm+mn+kn+lk\\

Here perimeter is given as 132 so this gives:

\text{perimeter}=lm+mn+kn+lk\\132=8x+8x+8x+9x\\132=33x\\x=\dfrac{132}{33}\\x=4

So the four legs are of length as given below:

lm=8x=8\times 4=32\\mn=8x=8\times 4=32\\lk=8x=8\times 4=32\\kn=9x=9\times4=36

So the length of legs lm, mn, and lk is 32 while that of kn is 36.

6 0
3 years ago
Can someone help me plzzz
tangare [24]

Step-by-step explanation:

B OPTION IS RIGHT ANSWER

3 0
3 years ago
What is the product of 2+i and 3-2i?
Darina [25.2K]

Answer:

8-i

Step-by-step explanation:

(2+i)(3-2i)

6-4i+3i-2(-1)

6-i+2

8-i

5 0
2 years ago
Mr Thompson please answer. This is hw that is for mathematics Algebra.
ddd [48]

Answer:

question 6:

x^{2} + 9x + 14 and (x + 2) (x + 7)

question 7:

x^{2} - 7x + 10 and (x - 2)(x - 5)

question 8:

x^{2} - 9x + 20 and (x - 4)(x - 5)

question 9:

(x + 1) (x - 17)

x^{2} - 17x + 1x - 17

x^{2} - 16x - 17

question 10:

(x - 1) (x + 17)

x^{2} + 17x - 1x - 17

x^{2} + 16x - 17

6 0
3 years ago
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