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3 years ago

How do you solve x+5y=-3 3x-2y=8

2 answers:

6 0

Use substitution.

First we want to isolate one of the variables. Here's how you'd do that.

x +5y = -3
x = -3 -5y

Now we can just substitute -3 -5y for x in the other equation and solve for y!

3x - 2y = 8
3(-3 -5y) -2y = 8
-9 -15y -2y = 8
-9 -17y = 8
17y = 17
y = 1

And then use y = 1 in an earlier equation to find x.

x + 5y = -3
x + 5*1 = -3
x + 5 = 3
x = -2

lianna [129]3 years ago

6 0

The way I would do it is the following.

Multiply x+5y=-3 by 3, making it 3x+15y=-9. Now, you can subtract the one equation from the other So, if you wrote it properly, it would look like

3x+15y=-9
-(3x-2y=8)
------------
=>17y=-17 which means y=-1. Now you can plug in y=-1 in the first equation, x+5y=-3, showing that x-5=-3, meaning x=2.

This is how I would do it. Of course, one could also solve for x in terms of y in the first equation, solving that x=-3-5y, and then substituting that into the second equation. I hope this is helpful.

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rewona [7]

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Step-by-step explanation:

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Steps:

I will solve your system by substitution.

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(Divide both sides by 6)

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4 years ago

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What metric measurement is the best estimate for measuring a car.

Dovator [93]

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3 years ago

I need help can I have how to do it and some work so I can do it.

tiny-mole [99]

Answer:

(-1,-2) OR x = -1 and y = -2

Step-by-step explanation:

y = 3x + 1

y = -x -3

so you would first multiply everything on y = -x -3 by 3 and get 3y = -3x -9

so then you would add 3y = -3x -9 to y = 3x + 1 ( to eliminate the x )which would be 4y = -8 then divide by 4 and get y = -2

then you plug in y = -2 into any one of the equations but to make it easier i am going to plug it into y = -x -3 so now it would be -2 = -x - 3 then, add 2 to both sides which would be 0 = -x -1 then add 1 to both side 1 = -x then multiply both sides by -1 and get x = -1

SO your answer would be (-1,-2) OR x = -1 and y = -2 ( both of them are correct but it depends on what the teacher taught you)

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You are trying to figure out how many gumballs you need to fill a 7.3 x 5.0 x 9.4 rectangular box for Halloween. Each gumball ha

riadik2000 [5.3K]

According to the calculations made, 410 gumballs will be needed to fill the box.

Since you are trying to figure out how many gumballs you need to fill a 7.3 x 5.0 x 9.4 rectangular box for Halloween, and each gumball has a radius of 1/2 in, if the packing density for spheres is 5/8 of the volume will be filled with gumballs while the rest will be air how many gumballs will be needed, to determine this amount the following calculation must be performed:

(Volume of box x 5/8) / volume of gumballs = Amount of gumballs
Volume of a sphere = 4/3 x 3.14 x (radius x radius x radius)
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Therefore, 410 gumballs will be needed to fill the box.

Learn more in brainly.com/question/1578538

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3 years ago