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2 years ago

Please help me solve 3x + 4y =15 and 3x - y = 30 it is for Algebra I

Mathematics

2 answers:

Makovka662 [10]2 years ago

7 0

Answer:

Step-by-step explanation:

Given the simultaneous equation

3x+4y=15. Equation 1

3x-y=30. Equation 2

Using elimination method

Sutract equation 2 from 1

Then, will have

3x-3x+4y--y=15-50. -×-=+

4y+y=-15

5y=-15

Divide Both sides by 5

y=-15/5

y=-3

From equation 2

3x-y=30

3x--3=30

3x+3=30

3x=30-3

3x=27

Divide both side by 3

x=27/3

x=9

Then, x=9 and y=-3

Colt1911 [192]2 years ago

7 0

Answer:

x=7 y=-9

Step-by-step explanation:

Use a system of equations to solve.

3x-y=30 changes to y=-30+3x

This can then be substituted into the other equation.

3x+4(-30+3x)=15

solve for x

X=7

Now use 7 in the other equation.

y=-30+x(7)

y=-9

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The second ramp needs to have 25°.

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Required ramp angle for driving the car from the ground = 35°.

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2 years ago

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2 years ago

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Is 59 rational or irrational explain

saw5 [17]

59 is a rational number
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If there are 24 blue blocks and six of them are red what percentage of the blocks are red

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Answer:

20 % are red

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I THINK this is what you mean:

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