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dem82 [27]
3 years ago
9

PLEASE HELP ME SOLVE THESE!

Mathematics
2 answers:
nikdorinn [45]3 years ago
8 0

Answer:

Question 1

Original Equation:

-3n-4n-17=25

Add 17 to both sides (cancels out the -17)

-3n-4n=42

Combine -3n and -4n.

-7n=42

Divide by -7

n = -6

Question 2

Original Equation:

-15+7.5(2d-1)=7.5

Distribute:

-15+15d-7.5=7.5

Add 7.5 to both sides:

-15+15d=15

Add 15 to both sides:

15d=30

Divide by 15:

d = 2

Let me know if this helps!

VLD [36.1K]3 years ago
6 0

Answer:

-3n-4n = 25 + 17

-7n = 42

n= -6

the main thing for here is to combine the like terms and to solve for n which is done by putting all the numbers with variables on one side and the non variables on the other and divide each side by the number that has the variable. Remember that when you bring numbers on the other side, you change its sign, for example if you have 5 on one side and you bring to the other side of the equal sign it becomes -5.

-15 + 15d -7.5d =7.5

15d - 7.5d = 7.5 + 15

7.5d = 22.5

d = 3

for the part where theres 7.5(2d-1)

you multiply each number inside the bracket by 7.5, its called distributivity of multiplication

hope that answers your question

hope you understand what i wrote lol

good luck:)

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eimsori [14]

Couple things to note:

  1. Slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.
  2. Slope can be calculated using any two points on a line and the formula y₁ - y₂ / x₁ - x₂.

For the first problem, we know the slope of Function A is 6 (refer to slope-intercept form above). To compare the slopes of Function A and Function B, first find the slope of Function B.

Use y₁ - y₂ / x₁ - x₂. Two points on the line are (0, 1) and (-1, -2). Plug these into the formula accordingly and solve for slope.

y₁ - y₂ / x₁ - x₂

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The slope of Function B is 3. This is half of 6 (the slope of Function A), so the correct answer to question 1 is the first option: Slope of Function B = 2 × Slope of Function A.

For the second problem, substitute m and b in y = mx + b according to the graph. b is the y-intercept (the point at which the line intersects the y-axis); it is (0, -4), or -4. This gives us

y = mx - 4

We must now find m. Follow the same steps above to find slope. Our two points are (-2, 0) and (0, -4).

y₁ - y₂ / x₁ - x₂

0 - (-4) / -2 - 0

0 + 4 / -2

4 / -2

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Substitute.

y = -2x - 4

The first option is the correct answer.

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