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Xelga [282]
3 years ago
7

Question 7 of 10

Mathematics
2 answers:
horsena [70]3 years ago
7 0

Answer:

D. Multiply the top equation by -3.

Step-by-step explanation:

2x – 4y= 5           -3(2x – 4y= 5)          -6x + 12y= -15

6x - 3y=10                                                6x - 3y=10

No you can eliminate -6 and 6

omeli [17]3 years ago
3 0

Answer:

The answer is D.

Step-by-step explanation:

D. Multiply the top equation by -3.

This works because if you multiply the top equation by -3 then it will be

-3(2x – 4y= 5) which is -6x + 12y = -15

now our equation is : -6x +12y = -15

                                     6x - 3y = 10

As you can see we can eliminate -6x and 6x if we add those two equation together.

   

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I need help on #4 & #6
Elan Coil [88]
So for 4, first thing you need is slope. Choose 2 points. I am choosing (8,2) and (6,3) So, then its the second y term subtracted by the first y term over(Or divided by) the second x term subtracted by the first x term.
3-2/6-8 or 1/-2 or -.5 (negative 0.5)
Now, time to find the yintercept(yint). So, choose one of the points, Im choosing (8,2), and put it into slope intercept, but leave yint as b.
(2)=-.5(8)+b
simplify
2= -4+b
subtract -4
b=6
So, your answer is y= -0.5x+6
I will right number 6 in anoher answer


6 0
3 years ago
A friend lends you $400, which you agree to repay with 6% interest. How much will you have to repay?
SashulF [63]

Answer:

The worth of the bond will be $5000 in 6 month

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The sum of two numbers is 12. 3 times the first number decreased by the second number is 24. Find the numbers.
lana [24]

Answer:

9 and 3

Step-by-step explanation:

Let the first number be x and second number be y hence their sum

x+y=12 ......(1)

Making x the subject theb x=12-y

Three times be first number is 3x

3x-y=24.......(2)

Adding the two sets of equations then

4x=36

X=36/4=9

The second number will be 12-9=3

So the first number is 9 and second is 3

6 0
4 years ago
HELPPP PLEASE!!!<br> What is the interior angle sum of a shape that has 45 sides?
ANTONII [103]
15840 degrees

Hope this helps!
7 0
3 years ago
Solve the following quadratic equation by using the quadratic formula.
Bas_tet [7]

Answer:

B. \frac{-3}{4}±\frac{\sqrt{41} }{4}

Step-by-step explanation:

First, substitute the equation into the quadratic formula.

x=\frac{b+-\sqrt{(b^{2} )-4(a)(c)} }{2a}

x=\frac{-3+-\sqrt{(3)^2-4(-2)(4)} }{4}

Solve for x.

x= \frac{-3+-\sqrt{9+32} }{4}

x=\frac{-3+-\sqrt{41} }{4}

The answer is x= -\frac{3}{4}±\frac{\sqrt{41} }{4}

6 0
3 years ago
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