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earnstyle [38]
3 years ago
8

Enter the x-coordinate of the solution to this system of equations

Mathematics
1 answer:
Kitty [74]3 years ago
5 0

Answer:

equation 2into minus 3 into equation 1

8x+ 3y= -28

-3x-3y=18

----------------

5x=10

x =2

put value of y in equation 2

8 into 2+3y=-28

16+3y= -28

3y= -28+16

3y= -12

y= -4

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Please help? 20 points!!!!!!!!!!!!!!!!!!
Vinvika [58]

Answer:

Year 12

They will be 62 inches

Brainliest plz took me so loong

Step-by-step explanation:

Year 1: Eva 40, Naomi 29

Year 2: Eva 42, Naomi 32

Year 3: Eva 44, Naomi 35

Year 4: Eva 46, Naomi 38

Year 5: Eva 48, Naomi 41

Year 6: Eva 50, Naomi 44

Year 7: Eva 52, Naomi 47

Year 8: Eva 54, Naomi 50

Year 9: Eva 56, Naomi 53

Year 10: Eva 58, Naomi 56

Year 11: Eva 60, Naomi 59

Year 12: Eva 62, Naomi 62

Equation:

12 years so

Eva's equation: 12x2=24 24+38=62

Naomi's equation:12x3=36 36+26=62

4 0
3 years ago
two wheels are rolled simultaneously. The radius of the smaller wheel is r feet and the radius of the larger wheel 2r feet. If b
Nuetrik [128]
The circumference of a circle is C=2πR, where R is the radius of the circle and π≈3.14.

So if we open the circumference of the circle into a straight line segment, the length of this segment is C=2πR≈2*3.14*R=6.28R

4 rotations mean 4 circumferences that is 4 segments of length 6.28R, 
which makes a linear distance of 4*6.28R=25.12R


i: the radius of the smaller wheel is R=r, thus it covers a distance of 25.12r feet

ii: the radius of the smaller wheel is R=2r, thus it covers a distance of  25.12*2r=50.24r (feet)

50.24r is twice 25.12r, thus the larger wheel traveled Twice the distance of the smaller one.


Answer: the larger covered twice the distance of the smaller.
6 0
3 years ago
EASY POINTS!!
MrRissso [65]
<h2>True </h2>

<h3>This curve passes the vertical line test, therefore it is a function.</h3>

<h3>The idea behind the vertical line test is that if you draw any vertical line, it has to intersect the curve only once. If there is more than 1 intersection, then it is not a function.</h3>

ps: This is a quadratic function of equation

f(x) =  - x {}^{2}  + 4

4 0
3 years ago
Monica is attempting to factor the expression 18x2 + 27x – 5. In her first step, she rewrites the expression as 18x2 + 32x – 5x
lisabon 2012 [21]

Answer:

B


Step-by-step explanation:

For quadratic expression in this form, the first step is to multiply the number in front of x^2 with the last term, the constant (with the sign in front as well). This is the "multiplied number".

Step 2 is to come up with 2 numbers which when multiplied is equal to the "multiplied number" in step 1 above and also add to the number in front of x.


For this problem, we would need 2 numbers that

  • Add up to 27, and
  • When multiplied, comes to -90 <em>(18 * -5 = -90)</em>

They already found the 2 numbers as expressed in the form shown  18x^2+32x-5x-5. The 2 numbers are +32 and -5.


<em><u>Do they add up to 27, as required?</u></em>

Yes, 32-5=27

<u><em>Do they come to -90 when multiplied?</em></u>

No, 32 * -5 = -160


Hence, they add up, BUT NOT multiplied.

So the answer choice B is right.

5 0
3 years ago
Perform the indicated operation. x/2+y/3-z/4
weeeeeb [17]

\bf \cfrac{x}{2}+\cfrac{y}{3}-\cfrac{z}{4}\implies \stackrel{\textit{using the LCD of 12}}{\cfrac{(6)x~~+~~(4)y~~-~~(3)z}{12}}\implies \cfrac{6x+4y-3z}{12}

3 0
3 years ago
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