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Help Me, please

solve the Equations. Express the fractions answer as a decimal to the nearest tenth.

Solve for x and y

 

x-y= -3

3x+2y= 16

ManuelBautista2019  Dec 5, 2017

Best Answer 

 #1
avatar+498 
+2

It's been a while since I've posted a math explanation...

 

Alright, you'll have to subtract those two equations, but you have to make one term (with variable) the same.

Let's allow both equations to have 3x. 

3x+2y=16 already has 3x inside, so leave it alone.

So for x-y=-3 to have 3x, you multiply 3 to every term in that equation. 

3x-21=-9.

Let's subtract now.

 

        3x-3y=-9

-

        3x+2y=16

________________

         -5y    = -25

          

 

So we have -5y = -25

Divide both sides by -5 and you get y=5.

Plug 5 for y in any equation to get x. I'll use the first one. 

x-5=-3

x = 2

 

So x=2, y=5.

Gh0sty15  Dec 5, 2017
Sort: 

3+0 Answers

 #1
avatar+498 
+2
Best Answer

It's been a while since I've posted a math explanation...

 

Alright, you'll have to subtract those two equations, but you have to make one term (with variable) the same.

Let's allow both equations to have 3x. 

3x+2y=16 already has 3x inside, so leave it alone.

So for x-y=-3 to have 3x, you multiply 3 to every term in that equation. 

3x-21=-9.

Let's subtract now.

 

        3x-3y=-9

-

        3x+2y=16

________________

         -5y    = -25

          

 

So we have -5y = -25

Divide both sides by -5 and you get y=5.

Plug 5 for y in any equation to get x. I'll use the first one. 

x-5=-3

x = 2

 

So x=2, y=5.

Gh0sty15  Dec 5, 2017
 #2
avatar+79894 
+1

Good job, Ghosty  !!!

 

 

cool cool cool

CPhill  Dec 5, 2017
 #3
avatar+233 
+1

Thanks Ghosty

ManuelBautista2019  Dec 5, 2017

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