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Serhud [2]
2 years ago
15

Help please I need an answer for this fast

Mathematics
1 answer:
castortr0y [4]2 years ago
6 0

Answer:

B 9, -9

Step-by-step explanation:

x^2 - 81 = 0

Add 81 to each side

x^2 = 81

Take the square root of each side

sqrt(x^2) = sqrt(81)

x = ±9

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5y + 6 = 25 + 6 what property of equality is used
steposvetlana [31]
Addition property
6=6 then 5y+6=25+6
7 0
2 years ago
Can anyone please help FAST! I’m looking for the correct answer and how you explain it! I’ll mark brainlist please and thank you
rosijanka [135]
1a. Y = mx + b
Y = 2x + b
-2 = 2(5) + b
-2 = 10 + b, b = 12
Equation: y = 2x + 12

1b. Standard form: Ax + By = C
subtract 12 and y from both sides
2x - y = -12
Equation: 2x - y = -12
7 0
3 years ago
Read 2 more answers
PLEASE HELP I BEG YOU I REALLY NEED HELP FEW QUESTIONS :(
pantera1 [17]
Number 2 for question 1 and number 4 for question 2
6 0
3 years ago
Solve the system of linear equations Y+2.3=0.45x -2y=4.2-7.8
Zina [86]
Solve the following system using substitution:
{y + 2.3 = 0.45 x
{-2 y = -3.6

In the second equation, look to solve for y:
{y + 2.3 = 0.45 x
{-2 y = -3.6

-3.6 = -18/5:
-2 y = -18/5

Divide both sides by -2:
{y + 2.3 = 0.45 x
{y = 9/5

Substitute y = 9/5 into the first equation:
{4.1 = 0.45 x
{y = 9/5

In the first equation, look to solve for x:
{4.1 = 0.45 x
{y = 9/5

4.1 = 41/10 and 0.45 x = (9 x)/20:
41/10 = (9 x)/20

41/10 = (9 x)/20 is equivalent to (9 x)/20 = 41/10:
{(9 x)/20 = 41/10
{y = 9/5
Multiply both sides by 20/9:
Answer:  {x = 82/9
                {y = 9/5
3 0
3 years ago
Read 2 more answers
(0, 4) and (4,0)<br> Rate of Change: <br> b=
yawa3891 [41]

Answer:

b=4

Step-by-step explanation:

5 0
2 years ago
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