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Valentin [98]
2 years ago
9

I NEED HELP ASAP AND PLEASE GIVE A STEP BY STEP FOR THE EXPLANATION WORTH 15 points

Mathematics
1 answer:
Karolina [17]2 years ago
4 0

Answer:

Step-by-step explanation:

the second one , why? because 7a-12a=-5a

4  - 8 = -4

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PLEASE HELP I HAVE 2 MORE THEN IM DONE OR TONIGHT (then i start again tmr ;( )
ryzh [129]

Answer:

1. 9

2. 32

3.

4. 69

7 0
2 years ago
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If the length of the major axis of an ellipse is 28 units and the foci are located 3.5 units away from the center, what is the e
Mandarinka [93]
Eccentricity = foci / half the length of the major axis
 = 3.5 / 14 = 1/4
3 0
3 years ago
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Which values for A and B will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b
Nata [24]

Answer:

a = -2 , b = -8

Step-by-step explanation:

* Lets talk about the solution of the linear equations

- There are three types of the solutions of the system of linear equations

# If the two lines intersect each other, then there is one solution

- The equations are ax+ by = c , dx + ey = f

# If the two lines parallel to each other, then there is no solution

- The equations are ax+ by = c , ax + by = d in its simplest form ,

  where a is the coefficient of x , b is the coefficient of y and

  c , d are the numerical terms

# If the two lines coincide (over each other), then there are infinite

   solutions

- The equations are ax+ by = c , ax + by = c in its simplest form, where

  a is the coefficient of x , b is the coefficient of y and c is the

  numerical term

* Lets solve the problem

∵ The system of equation is:

   ax - y = 8 ⇒ (1)

   2x + y = b ⇒ (2)

∵ The system create infinitely many solutions

∴ The lines are coincide

- The equations must be equal, then multiply equation(1) or (2) by -1 to

  make the coefficient of y in the two equations equal

∴ -ax + y = -8

∴ 2x + y = b

∵ Their coefficients of x are equal

∵ Their coefficients of y are equal

∵ Their numerical terms are equal

∵ The coefficient of x in equation (1) is -a and in equation (2) is 2

∴ -a = 2 ⇒ multiply both sides by -1

∴ a = 2

∵ The numerical term in equation (1) is -8 and in equation (2) is b

∴ b = -8

* The values for a and b will create infinitely many solutions are -2 , -8

5 0
3 years ago
What is the answer to this please help!
Butoxors [25]

z+(-0.72)=-2.5\\\\\text{Step 1}:\ x+(-0.72)+(-0.72)=-2.5+(-0.72)\qquad\text{ERROR}\\\\CORRECT\ IS:\ x+(-0.72)-(-0.72)=-2.5-(-0.72)\\\\\text{Step 2}:\ x=-2.5+0.72\\\\\text{Step 3}:\ x=-1.78


Subtract, not add, -0.72 from both sides.

6 0
3 years ago
Basketballs cost $17 each. Adam purchased 8 basketballs for $136. Which equation uses the distributive property to show that Ada
arlik [135]

Answer:

c

Step-by-step explanation: because if you add  all of the 17's you will get 136 in total

3 0
3 years ago
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