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Alexus [3.1K]
3 years ago
5

Solve this system by substitution. Y=-8x-23 Y=-5x-14

Mathematics
2 answers:
matrenka [14]3 years ago
7 0
set\ them\ equal\ to\ each\ other \\ -8x-23=-5x-14 \\ -3x-23=-14 \\ -3x=9 \\ x= \frac{9}{-3} \\ x=-3 \\  \\ plug\ in\ OG\ equation \\ y=-8x-23 \\ y=-8(-3)-23 \\ y=24-23 \\ y=1 \\  \\ \boxed {(-3,1)}
cupoosta [38]3 years ago
3 0
Y = -8x - 23
<u>y = -5x - 14</u>
2y = -13x - 37
<u>2y</u> = <u>-13x - 37</u>
 2            2
  y = 6 1/2x - 18 1/2
  6 1/2x - 18 1/2 = -5x - 14
  <u>    +5x                 +5x        </u>
 11 1/2x - 18 1/2 = -14
<u>              +18          +18</u>
               11 1/2x = 4
             <u>  11 1/2x</u> = <u>   4    </u><u>
</u>               11 1/2    11 1/2
                         x = 8/23
y = -5(8/23) - 14
y = -1 17/23 - 14
y= -15 17/23
(x, y) = (8/23, -15 17/23)

<u />
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mrs_skeptik [129]

The perimeter of the shape is 94 cm and the area is 462 sq cm.

Step-by-step explanation:

Given,

The radius (r) = 14 cm

To find the area and perimeter of the given shape.

The given shape is \frac{3}{4} of the full circle.

Formula

The perimeter of the circle = 2πr

The perimeter of the given shape = \frac{3}{4}(2πr)+r+r =  \frac{3}{4}(2πr)+2r

The area of the circle = πr²

Now,

The perimeter of the given shape =  \frac{3}{4}(2×\frac{22}{7}×14)+2×14 =  94 cm

The area of the given shape = \frac{3}{4}(πr²)

= \frac{3}{4}×\frac{22}{7}×14² = 462 sq cm

7 0
3 years ago
Read 2 more answers
Tony buys 2 boxes of chocolates. One is 4 in. 7 in. 8 in. And 8 in. 5 in. 6 in. Which box has the larger volume?
Rufina [12.5K]

Answer:

Second box

Step-by-step explanation:

Volume (of the box) = length * width * height

Volume of first box is: 4 * 7 * 8 = 224

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Since 224 < 240, the volume of the second box has the larger value.

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