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Brilliant_brown [7]
3 years ago
8

-3x+5y=-9 and 4x+8y=12

Mathematics
2 answers:
liq [111]3 years ago
7 0

Let's solve your system by substitution.

−3x+5y=−9;4x+8y=12

Step: Solve−3x+5y=−9for x:

−3x+5y=−9

−3x+5y+−5y=−9+−5y(Add -5y to both sides)

−3x=−5y−9

−3x

−3 = −5y−9 −3

(Divide both sides by -3)

x=

5

3

y+3

Step: Substitute

5

3

y+3forxin4x+8y=12:

4x+8y=12

4(

5

3

y+3)+8y=12

44

3

y+12=12(Simplify both sides of the equation)

44

3

y+12+−12=12+−12(Add -12 to both sides)

44

3

y=0

44

3

y

44

3

=

0

44

3

(Divide both sides by 44/3)

y=0

Step:

3 y+3:

x= 5

3 y+3

x= 5

3 (0)+3

x=3(Simplify both sides of the equation)

Answer:

x=3 and y=0

insens350 [35]3 years ago
4 0

-3x + 5y = -9

4x + 8y = 12

Simplify the second,

x + 2y = 3

Times three,

3x + 6y = 9

Add to the first equation,

11y = 0

y = 0

-3x + 5(0) = -9

x = 3

Answer: x=3, y=0

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Bogdan [553]

Answer:

$20

Step-by-step explanation:

if one ound = 16 ounces then you would do 1.25x16 witch equals $20

5 0
2 years ago
What is the volume of the box with a height of 3/2 inches, a length of 7/2 inches, and a width of 5/2 inches?
masha68 [24]

Answer:

Volume = 52.5³

Step-by-step explanation:

Volume = Length * Width * Height

Substitute

Volume = 7/2 * 5/2 * 3/2

Volume = 105/2³

Simplify

Volume = 52.5³

Hope this was useful to you!

4 0
3 years ago
Write an equation of a line in slope-intercept form that passes through the point (-2, 4) and has a slope of -3. (no spaces in y
mrs_skeptik [129]

Answer:

y = - 3x - 2

Step-by-step explanation:

Step 1:

y = mx + b     Slope Intercept Form

Step 2:

y = - 3x + b     Input Slope

Step 3:

4 = - 3 ( - 2 ) + b     Input x and y

Step 4:

4 = 6 + b     Multiply

Step 5:

- 2 = b       Subtract 6 on both sides

Answer:

y = - 3x - 2

Hope This Helps :)

8 0
3 years ago
Kirima is building a wall for her snow fort. She first makes a firm base out of snow, and then piles uniformly sized blocks of s
makkiz [27]

Answer:

The correct options are;

0.4 represents the height of each block

0.6 represents the height of the base

Step-by-step explanation:

The given information are;

The activity Kirima is engaged in = Building a wall

The process by which she is building the wall includes

1) Construction of a base on the floor

2) Piling blocks of uniform height to form the wall

3) Estimating the height of the wall she is constructing with the expression 0.4·x + 0.6 where the constants which are 0.4 and 0.6 are in meters;

From her procedure, we have the constants, which are the values that do not change as follows;

1) The firm base

2) The uniformly sized blocks

Of the two constants, the one that consists of multiple items is the uniform sized blocks as they are laid in brick pattern

There is only one firm base

Therefore, the constant that has a variable is the uniform sized blocks

Which gives in the expression 0.4·x + 0.6, we have;

0.4 = The dimension of the uniform sized blocks

∴ 0.6 = The dimension of the firm base.

7 0
3 years ago
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Dvinal [7]

Answer:

30

Step-by-step explanation:

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8 0
3 years ago
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