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iragen [17]
2 years ago
12

Use substitution to solve the following system of equations. 9x + 5y = 32 AND y = -3x + 4

Mathematics
1 answer:
Darya [45]2 years ago
4 0

Answer:

x = -2

y = 10

Step-by-step explanation:

Since they already gave y as -3x +4, you will then have to substitute that amount into the formula

9x + 5y = 32

By doing that you get

9x +5(-3x+4) = 32

9x -15x +20 = 32

Then, you ill take 20 to the other side to subtract 32, which will get you

-6x = 12

Then, you will get x = -2

Then substitute that for the equation

y = -3x + 4

You will get

y = -3(-2) + 4,

You will get y as 10

SO then your final answer is x = -2, y = 10

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A cylinder has a volume 1200 cubic inches and radius 5 inches. What is the height of the cone to the nearest tenth inch
mihalych1998 [28]

Answer: 15.3 in

Step-by-step explanation:

First, the formula for the volume is: V=\pi r^2h

If you solve for h,

h=\frac{V}{\pi r^2}

h=\frac{1200in^3}{(3.14)(5in)^2}

h=15.3in

3 0
3 years ago
Write an equation of a line in point-slope, slope-intercept, and standard form that has
Inga [223]

Answer:

(a) y + 4x - 14 = 0

(b) y = -4x + 14

(c) y + 4x = 14

Step-by-step explanation:

The formula for calculating the equation of line in point - slope form is given as :

y-y_{1}  = m(x-x_{1} )

where m is the slope

Given from the question :

m = - 4

x_{1} = 2

y_{1} = 6

Substituting into the formula , we have :

y - 6 = - 4(x - 2)

y - 6 = -4x + 8

y + 4x - 6 - 8 = 0

y + 4x - 14 = 0

Therefore :

(a) the equation of the line in point - slope form is y + 4x - 14 = 0

(b) to write it in slope - intercept form , we will make y the subject of the formula , which will give : y = -4x + 14

(c) the equation of line in standard form is ; y + 4x = 14

5 0
3 years ago
Which statement best describes the relationship between the number of chores completed and the number of hours spent on the inte
Maksim231197 [3]
C. For every decrease of one chore completed, one hour was spent on the internet.
4 0
2 years ago
What is the angle of DBC
Licemer1 [7]
When added, these two angles are supplementary, meaning that their sum is 180. This means that we can do the following to find x, and eventually DBC:

3x+67+4x+50=180
Simplifies to:
7x+117=180
Then by the Subtraction Prop. of Equality:
7x=63
Then divide by 7 on both sides to get that x=9.

We then substitute 9 into angle DBC.
4(9)+50
=36+50
DBC=86

:)

8 0
3 years ago
One teacher wants to give each student 7 over 9 of a slice of pizza. If the teacher has 7 slices of pizza, then how many student
Anna007 [38]
Total = 7 slices.
1student = 7/9 of a slice.

Total number of students:

7 \div  \dfrac{7}{9} 

= 7 \times  \dfrac{9}{7}

= 9

---------------------------------------------------------------------------
Answer: She will be able to hand out to 9 students.
---------------------------------------------------------------------------
3 0
3 years ago
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