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enot [183]
3 years ago
12

1. which of the following is a solution to the equation y = 3x - 1

Mathematics
1 answer:
Assoli18 [71]3 years ago
5 0
The given equation is y = 3x - 1.

Test the given solutions.
A. (4,1)
y = 1
3x-1 = 3*4 - 1 = 11
Incorrect

B. (2,5)
y = 5
3x-1 = 3*2 - 1 = 5
Correct

C. (4,3)
y = 3
3x-1 = 3*4 - 1 =11
Incorrect

D. (0, -3)
y = 0
3x-1 = 3*0 - 1 = -1
Incorrect

Answer: B. (2,5)

1. x- 6 = -18
    Add 6  to each side.
    Answer: x = -12

2. 4x + 3 = 47
    Subtract 3 from each side.
    4x = 44
    Divide each side by 4.
    Answer: x = 11

3. 1/3x = 12
     Multiply each side by 3x.
     1 = 36x
     Divide each side by 36
     Answer:  x = 1/36

4. 3x + 3 = 21
    Subtract 3 from each side.
    3x = 18
    Divide each side by 3.
    Answer: x = 6

5. 3/2x - 4 = 16
    Add  4  to each side.
    3/2x = 20
    Multiply each side by 2x.
    3 = 40x
    Divide each side by 40.
    Answer  x = 3/40
  
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Im guessing ten or some sort of factor of ten
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3 years ago
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A circle has a diameter of 42 mm. What is the circumference of this circle? (use 22/7 for pi; show your work in numbers)
stellarik [79]

Answer:

132

Step-by-step explanation:

Find Radius (r)

42/2 = 21

Plug 21 into Circumference Equation

2πr (In this case, π is 22/7)

Simplify

42 (22/7)

<u>132</u>

8 0
3 years ago
How to solve for -3x squared + 2y squared + 5xy - 2y + 5x squared - 3y squared when x = 0.5 and y = -1/10??
Pani-rosa [81]

Answer:

0.44

Step-by-step explanation:

-3x^2 + 2y^2 + 5xy - 2y +5x^2 - 3y^2

Combine like terms

-3x^2 + 5x^2 = 2x^2 2y^2 - 3y^2 = -1y^2

2x^2 - 1y^2 + 5xy - 2y

Now plug in the solutions Note: it is easier if you have all decimals or all fractions (-1/10=-.1

2(0.5)^2 - 1(-0.1)^2 + 5(0.5)(-0.1) - 2(-0.1)

Simplify:

0.5 - 0.01 - 0.25 + 0.2

0.5 + 0.2 - 0.01 - 0.25

0.7 - 0.26

0.44

5 0
3 years ago
(8x-4)+(17x-23)+(3x+17)=180
12345 [234]

Answer:

b

Step-by-step explanation:

b

7 0
3 years ago
Please help me ASAP!!
choli [55]

Answer:

r = -4

Step-by-step explanation:

If M is the midpoint of DE, that would mean that the distance from M to D and M to E would be the same.

This creates the equation 1-8r=13-5r.

Now it's just simple algebra.

You add 8r to both sides, creating 1=13+3r. Then, you subtract 13 from both sides, getting 3r=-12. Dividing both sides by 3 and solving for r, you get r=-4.

Checking our answer, you see that 1-8(-4)=1-(-32)=1+32=33, and 13-5(-4)=13-(-20)=13+20=33.

8 0
2 years ago
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