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faltersainse [42]
3 years ago
10

Which ordered pairs in the form  (x, y) are solutions to the equation 7x−5y=28 ?Solation 7x−5y=28 ? A. (−6, −14) B. (7,9) C. (4,

10) D.(-1,-7)
Mathematics
1 answer:
Mkey [24]3 years ago
7 0
Probe every pair:

pair                 x          y           7x - 5y

A. (-6,-14)      -6       -14          7(-6) - 5(-14) = -42 + 70 = 28 => it is a solution

B. (7,9)           7          9          7(7) - 5(9) = 49 - 45 = 4 => not a solution

C. (4,10)        4          10        7(4) - 5(10) = 28 - 50 = - 22 => not a solution

C. (-1,-7)        -1          -7       7(-1) - 5(-7) = -7 + 35 = 28 => it is a solution

Answer: option A. (-6,-14) and option D. (-1,-7)
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3 years ago
A line goes through the point (6,–2) and has a slope of –3. What is the value of a if the point (a,7) lies on the line? A =
Sati [7]

Answer:

Step-by-step explanation:

Y = mx + b

slope(m) = 3/4

(3,7)...x = 3 and y = 7

now we sub...we r looking for b, the y int

7 = 3/4(3) + b

7 = 9/4 + b

7 - 9/4 = b

28/4 - 9/4 = b

19/4 = b

equation is : y = 3/4x + 19/4...lets put this in standard form

y = 3/4x + 19/4

-3/4x + y = 19/4...multiply by -4

3x - 4y = -19 <== standard form

if (x,5) is on the line

3x - 4y = -19.....sub in 5 for y

3x - 4(5) = -19

3x - 20 = -19

3x = -19 + 20

3x = 1

x = 1/3 <====so point a = (1/3,5)

4 0
4 years ago
Read 2 more answers
Can somebody help me
nata0808 [166]

Answer:

AB ≈ 3.14 ft

Step-by-step explanation:

The arc AB is calculated as

AB = circumference of circle × fraction of circle

    = πd × \frac{45}{360} ( where d is the diameter )

    = 8π × \frac{1}{8}

   = π

   ≈ 3.14 ft ( to 2 dec. places )

8 0
3 years ago
Jennifer buys 4.25 pounds of gummy worms for $2.96 per pound and 0.5 pounds of jaw
GuDViN [60]

Answer:

$4.94

Step-by-step explanation:

Gummy worms cost $2.96 per lb, and she bought 4.25 lbs, so:

2.96 * 4.25 = $12.58 spent in gummy worms

Jaw breakers cost $4.95 per lb, and she bought 0.5 lbs, so:

4.95 * 0.5 = $2.48 spent in jaw breakers

Adding the gummy worms and the jaw breakers, she spent:

12.58 + 2.48 = 15.06 in Total

She gave the clerk $20.00, but she only spent only $15.06, so the clerk gave her back the difference:

20 - 15.06 = $4.94 is the change that she received

4 0
3 years ago
Type an equation for the following pattern: x: 1, 2, 3, 4, 5, y: 3, 4, 5, 6, 7 y=1x [?]
KATRIN_1 [288]
Y = x + 2. i hope this helped
8 0
3 years ago
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