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3 years ago

Need help pls solve 7x-4y=-7 5x+y=22

Mathematics

2 answers:

Vinil7 [7]3 years ago

8 0

I think this would be the correct answer {x,y} = {3,7}

aev [14]3 years ago

3 0

7x-4y=-7
5x+y=22

multiply 4 on the 2nd equation
20x+ 4y=88

now you have
7x -4y = -7
20x + 4y = 88
--------------------add
27x = 81
x = 3

7x-4y=-7
7(3)-4y=-7
-4y = -28
y = 7

answer (3, 7) is the solution

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Alex_Xolod [135]

Answer:

Define your variable and write your equation: 36 + b + (3b-28) = 180°.
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measure of the third angle: 101°

Step-by-step explanation:

a = 36

c = 3b - 28

a + b + c = 180°

a = measure of the first angle

b = measure of the second angle

c = measure of the third angle

then:

1) 36 + b + (3b-28) = 180 ⇒ )Define your variable. Write your equation and solve)

b + 3b + 36 - 28 = 180

4b + 8 = 180

4b = 180 - 8

4b = 172

b = 172/4

2) b = 43° ⇒ measure of the second angle

c = 3b - 28

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3) c = 101° ⇒ measure of the third angle

Check:

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3 years ago

1) State the amplitude, period, phase shift, vertical shift and graph

bogdanovich [222]

Answer:

See answers and explanations below (along with a visual graph)

Step-by-step explanation:

For the function $y=acos(b(x+c))+d$ :

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Period: $\frac{2\pi}{|b|}$

Phase shift: $\frac{-c}{b}$

Vertical shift: $d$

Therefore, for $y=2cos(\frac{2}{3}(\theta+\pi))-1$ :

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Period: $\frac{2\pi}{|b|}=\frac{2\pi}{|\frac{2}{3}|}=\frac{2\pi}{\frac{2}{3}}=3\pi$ , so the cycle will repeat every 3π units

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