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3 years ago

Reasoning Solve the system of linear equations using substitution. Use pencil and paper. Which

Mathematics

1 answer:

Y_Kistochka [10]3 years ago

5 0

Answer:

Since the first equation x is equal to 4y - 9, it is easier to substitute 4y - 9 in for x in the second equation.

x = -1 y = 2

Step-by-step explanation:

Since the first equation x is equal to 4y - 9, it is easier to substitute 4y - 9 in for x in the second equation. That would give you

4y - 9 + 4y = 7

8y - 9 = 7

8y = 16

y = 2

x = 4y - 9 = 4(2) - 9 = 8 - 9 = -1

It is always a good idea to check and see if your results satisfy the two equations

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Valentin [98]

Answer:

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Step-by-step explanation:

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3 years ago

If two lines having equations 3x+5y-16=0 and 4y-mx= 20 are parallel, find the value of m

sergejj [24]

Answer:

m = -3/5

Step-by-step explanation:

since both lines are given as "parallel", they will have the same slope, so we only need to solve for one.

we will put this equation into slope-intercept form to find the slope

3x + 5y - 16 = 0

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y = -3/5x + 16/5

m = -3/5

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3 years ago

What is the LCM and GCF for the numbers 81 and 99

artcher [175]

9 is the LCM, and the GCF is 27

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3 years ago

Read 2 more answers

A city council organized a marathon race to promote good health. There were 3 times as many female participants as male particip

hichkok12 [17]

Answer:

609 males

Step-by-step explanation:

A city council organized a marathon race to promote good health.

Let the number of

Females = x

Males = y

There were 3 times as many female participants as male participants in the marathon.

3x = y

If the total number of participants was 812,

x + y = 812..... Equation 1

We substitute 3x for y in Equation 1

x + 3x = 812

4x = 812

x= 812/4

x = 203 females

3x = y

Solving for y

3(203) = 609 males

The number of males participants = 609

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Afina-wow [57]

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4 years ago