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Serhud [2]
3 years ago
15

3x – y = 28 3x + y = 14

Mathematics
1 answer:
podryga [215]3 years ago
5 0

Step-by-step explanation:

3x=28+y

x=28+y÷3

then puttingx=28+y÷3

3x=14+y

3(28+y÷3)+y=14

84+3y+3y=42

3y+3y=42-84

y=-42÷6

y=7

so putting y=-7

3x-y=28

3x-7=38

x=38+7÷3

x=15

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3 years ago
At 1:00 the water level in a pool is 13 inches. At 2:30 the water level is 28 inches what is the rate of change?
Thepotemich [5.8K]

Answer:

b:1/10

Step-by-step explanation:

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3 years ago
I'LL GIVE YOU 40 POINTS!!!!
puteri [66]

using the FOIL method the equation gets pretty long

Multiply each term by each term and combine like terms the given equation simplifies to:

f(x) = -2x^5 - 9x^4 - 8x^3 + 15x^2 +28x + 12

The degree is equal to the highest exponent, which is the 5 on -2x^5

The degree is 5

The y intercept is the value of y when x is 0

Replace all the x's with 0 and solve the equation:

f(x) = -2(0)^5- 9(0)^4 - 8(0)^3 + 15(0)^2 +28(0) + 12

= 0 -0 -0 + 0 +0 +12 = 12

The y intercept is (0,12)

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