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Sever21 [200]
3 years ago
6

O eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied? First Equati

on: 5x − 4y = 28 Second equation: 3x - 9y = 30
A.The first equation should be multiplied by 3 and the second equation by 5.B.The first equation should be multiplied by 3 and the second equation by −5.C.The first equation should be multiplied by 9 and the second equation by 4.D.The first equation should be multiplied by 9 and the second equation by −4.
Mathematics
1 answer:
IceJOKER [234]3 years ago
7 0
"<span>D.The first equation should be multiplied by 9 and the second equation by −4." makes sense.  Let's do this work:

</span><span>First Equation: 5x − 4y = 28 Second equation: 3x - 9y = 30

45x - 36y = 252
-12x+36y = -120
----------------------
33 x = 132, so x = 4.  And so on.</span>
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PLEASE HELP ME I BEG YOU!!
ivann1987 [24]

1) false

2)true

3)-1.346

<span>4)<span><span>x=−5</span><span>x=-5</span></span></span>

<span>5)<span>x=3</span></span>

<span>6)x =~ 3.91 </span>

<span>7) x = 162.69 </span>

<span>hope I helped :)</span>

7)

6 0
3 years ago
Read 2 more answers
cynthia besch wants to buy a rug for a room that is 14ft wide and 23 ft long. She wants to leave a uniform strip of floor around
choli [55]
The room is 14w and 23 l

she can buy up to 190 sqft

190 factors into 10 and 19

14 - 10 = 4
23 - 19 = 4
Which are uniform

so the answer is 10 ft wide and 19 ft long

Hope this helps


8 0
3 years ago
Determine if line AB and line CD are parallel, perpendicular, or neither.
choli [55]

Answer:

AB and CD are parallel lines

Step-by-step explanation:

• Parallel lines have equal slopes

• The slopes of perpendicular lines are negative reciprocals

Calculate the slope m using the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

let (x₁, y₁ ) = A(1, 4) and (x₂, y₂ ) = B(3, 8)

m = \frac{8-4}{3-1} = \frac{4}{2} = 2

let (x₁, y₁ ) = C(- 1, 6) and (x₂, y₂ ) = D(3, 14)

m = \frac{14-6}{3+1} = \frac{8}{4} = 2

Since slope of AB and CD are equal then lines are parallel


3 0
3 years ago
Read 2 more answers
I would really appreciate the help! 15 points!
Katyanochek1 [597]
The slope would be 1/17 and then you would use that slope and plug it into the y=mx+b and solve for b
4 0
3 years ago
What is 2(3x + 12y - 5 - 17x - 16y +4) simplified?
fiasKO [112]

Answer:

<h2>2(-14x-4y-1) / -28x-8y-2</h2>

Step-by-step explanation:

2(3x + 12y - 5 - 17x - 16y +4)

the 2 outside the bracket means we need to multiply everything by 2

=

6x+24y-10-34x-32y+8

now put all the like-terms together

6x-34x+24y-32y+8-10

now add them together

=-28x-8y-2

now find the HCF

2

put 2 outside the bracket and then divide every number by 2

2(-14x-4y-1)

this is as simplified it can get

5 0
3 years ago
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