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3 years ago

Solve using substitution y=1/2x x+4y=18

Mathematics

1 answer:

Aleks [24]3 years ago

7 0

Answer:

The solution set is (6,3)

Step-by-step explanation:

Begin by multiplying equation 1 by 2. You'll see why in a moment

2y = 2*(1/2) x

2y = x

Substitute this value into equation 2.

2y + 4y = 18 Combine like terms on the left

6y = 18 Divide both sides by 6

6y/6 = 18/6 Do the division

y = 3

To solve for x just use the top equation

y = 1/2x

3 = 1/2x Multiply by 2

3*2 = x

x = 6

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3 years ago

Evaluate m – n if m = –16 and n = 28

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3 years ago

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Question 1 x - 2.5 = -3

MAVERICK [17]

Answer:

x = -.5

Step-by-step explanation:

x - 2.5 = -3

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3 years ago

What is the slope of line PQ?

Scilla [17]

we know that

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

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$P(-8,2)\ Q(4,2)$

substitute in the formula

$m=\frac{2-2}{4+8}$

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the line PQ is parallel to the x-axis

therefore

the answer Part a) is

$0$

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substitute in the formula

$m=\frac{-8-6}{8-8}$

$m=\frac{-14}{0}$

Anything divided by zero is undefined

m=undefined

therefore

the answer Part b) is

undefined

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we know that

Any line perpendicular to X-axis has slope undefined

Because the term $(x2-x1)$ will always be zero

the answer Part c) is

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Diano4ka-milaya [45]

Answer:

Sasha can buy 6 bottles of soda.

Step-by-step explanation:

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3 years ago