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Mekhanik [1.2K]
3 years ago
8

-7x2y=-13 x-2y=11 Slove useing subtract

Mathematics
1 answer:
babunello [35]3 years ago
7 0
-7x+2y=-13
x-2y=11
add them euations

-7x+2y=-13
<u>1x-2y=11 +</u>
-6x+0y=-2

-6x=-2
divide both sides by -6
x=1/3

sub back
x-2y=11
1/3-2y=11
minus 1/3 both sides
-2y=10 and 2/3
divide both sides by -2 (or times both sides by -1/2)
y=-5 and 1/3



x=1/3
y=-5 and 1/3
(1/3,-16/3)
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Kaitlyn and Hakim each bought a tube
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<h2>Answer:</h2>

<h3>container B requires more plastic to make.</h3>

<h2>Step-by-step explanation:</h2>

Container A:

diameter- 7 cm

height- 122 cm

radius- 3.5 cm

<h3>calculating for the surface area</h3>

SA=2×π×r×r+2×π×r×h

SA=2(3.14)(3.5)(3.5)+2(3.14)(3.5)(122)

SA=76.93+2681.56

SA=2758.49 cm^2

<h3>Container B:</h3>

diameter- 11 cm

height- 85 cm

radius- 5.5 cm

<h3>calculating for the surface area</h3>

SA=2×π×r×r+2×π×r×h

SA=2(3.14)(5.5)(5.5)+2(3.14)(5.5)(85)

SA=189.97+2935.90

SA=3125.87 cm^2

<h3>Container B required more plastic to make</h3>
7 0
2 years ago
For the function f(x)=-6X^2+3X +7 Evaluate f(-1)
Zigmanuir [339]

Answer:

f( - 1) =  - 2

Step-by-step explanation:

f(x) =  - 6 {x}^{2}  + 3x + 7 \\ f( - 1) =  - 6 {( - 1)}^{2}  + 3( - 1) + 7 \\  =  - 6(1) + ( - 3) + 7 \\  =  - 6 - 3 + 7 \\  =  - 2

I hope I helped you^_^

5 0
3 years ago
A bread recipe calls for 13 cup of butter. You want to make 12 of a batch.
Lostsunrise [7]

Answer:

156 cups of butter will be required.

Step-by-step explanation:

A bread recipe calls for the amount of butter = 13 cups

Now we have to prepare the 12 bread recipes.

Amount of butter required for 12 recipes = 13 times 12

                                                                    = 13 × 12

                                                                    = 156 cups

Therefore, 156 cups of butter will be required to prepare the 12 of a batch.

8 0
3 years ago
Read 2 more answers
will give brainliest! if the slope of the line through the points (a,14) and (8,a) is 1/2, what is the value of a?
castortr0y [4]

Answer:

a = 12

Step-by-step explanation:

Formula for calculating the slope of a line is expressed as;

m = ∆y/∆x

m = y2-y1/x2-x1

Given

m = 1/2

x1 = a

y1 = 14

x2 = 8

y2 = a

Required.

Value of a

Substitute the given parameters into the formula

1/2 = a-14/8-a

Cross multiply

1(8-a) = 2(a-14)

8-a = 2a-28

Collect like terms

-a-2a = -28-8

-3a = -36

a = -36/-3

a = 12

Hence the value of a is 12

6 0
3 years ago
Determine if the given relation is also a function.
trapecia [35]
It’s no!
Hope this helps!! Gl!
4 0
3 years ago
Read 2 more answers
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