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konstantin123 [22]
3 years ago
9

Solve the system of equations. 12x-5y=-20 y=x+4

Mathematics
1 answer:
Gwar [14]3 years ago
5 0

Answer:

x = 0, y = 4

Step-by-step explanation:

12x - 5y = 20

y = x+4

____________

12x - 5y = 20

-x + y = 4

___________

12x - 5y  = 20

5(-x+y = 4)

___________

12x - 5y = 20

-5x + 5y = 20

____________

7x = 0

x = 0

y = x + 4

y = 0+4

y = 4

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1 ten.

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Find an ordered pair x-2y=4​
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Step by Step:
x-2y=4
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A french class has a total of 25 student.The number of males is 7 more than the number of females how many males and how many fe
Lady_Fox [76]

Answer:

16 males and 9 females

Step-by-step explanation:

To solve this we can use a system of equations.

Let's start by naming the number of females x.

The number of males would then be y.

<u>Using these variables, we can set up 2 equations using info provided:</u>

A french class has a total of 25 students, -> x+y=25

The number of males is 7 more than the number of females -> x+7=y

Use substitution to solve.

<u>From the second equation:</u>

x+7=y

Subtract 7 from both sides.

x=y-7

Substitute that into the first equation.

x+y=25

y-7+y=25

Combine like terms.

2y-7=25

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Divide both sides by 2.

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Substitute y=16 into equation 2.

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x+7=16

Subtract 7 from both sides.

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Therefore, there are 16 males and 9 females in the french class.

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The height, h, in feet of a golf ball above the ground after being hit into the air is given by the equation, h = -16t 2 + 64t,
coldgirl [10]

Answer:

4 seconds

Step-by-step explanation:

When the ball is on the ground h = 0, hence

- 16t² + 64t = 0 ( solve for t )

factor out - 16t

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equate each factor to zero and solve for t

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the 0 solution is the height of the ball before being hit and

the time the ball takes to hit the ground is 4 seconds


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3 years ago
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