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NISA [10]
3 years ago
5

Help me solve this step by step please

Mathematics
1 answer:
bekas [8.4K]3 years ago
5 0

Answer:

2

Step-by-step explanation:

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Using substitution to solve the system below, what expression should be substituted into the first equation? 2x-4y=-4 and x+2y=8
inna [77]

Answer:

Given the system of equation:

2x-4y=-4                    ......[1]

x+2y=8                      ......[2]

we can rewrite equation [2] as;

x = 8-2y                ......[3]

Substitute equation [3] into [1] to eliminate x, and solve for y;

2(8-2y)-4y = -4

Using distributive property: a\cdot (b+c) = a\cdot b+ a\cdot c

16-4y -4y = -4

Combine like terms;

16 - 8y = -4

Add 4 to both sides we have;

20 - 8y = 0

Add 8y to both sides we have;

20 = 8y

Divide 8 to both sides we have;

y = 2.5

Substitute the y-value in [3] we have;

x = 8-2(2.5)

x = 8 - 5 = 3

Therefore, the  expression should be substituted into the first equation is, x = 8-2y  and also the value of x = 3 and y = 2.5

5 0
3 years ago
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The ages of Lee's mother and aunt total 83 years. If her mothers age were doubled, then her mother would be 58 years older than
NemiM [27]

Answer:

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Step-by-step explanation:

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3 years ago
What is the minimum cuts<br> needed to cut a circle into 8<br> equal parts?
Gnom [1K]

What is the minimum cuts  needed to cut a circle into 8  equal parts ?

A : 4 cuts

7 0
3 years ago
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Solve for x. 3x ^2 -4 = 8
LenKa [72]

Answer:

x = ±2

Step-by-step explanation:

3x ^2 -4 = 8

Add 4 to each side

3x ^2 -4+4 = 8+4

3x^2 =12

Divide each side by 3

3x^2 =12

3x^2/3 = 12/3

x^2 = 4

Take the square root of each side

sqrt(x^2) = ±sqrt(4)

x = ±2

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4 years ago
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telo118 [61]

Answer: 4 weeks (1 month)

Step-by-step explanation: If it took 14 hours for something half the size of the striped scarf then you will just double the time. 1 hour a day will be 28 days which is 4 weeks and almost a month.

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3 years ago
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