anonymous
  • anonymous
solve by substitution method 0.1x+0.9y=-4.1 0.6x-0.7y=5.9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
this time is your turn. Try to find the answer by yourself. The first thing to to here is to convert 0.1, 0.9, 4.1, 0.6, 0.7 and 5.9 into a fraction. 0.1 = 1/10 0.9=9/10 4.1=41/10 0.6=6/10 0.7=7/10 5.9=59/10 You have to follow the procedure Mathmind gave you before. If you have any question, ask :)
anonymous
  • anonymous
im stuck on this one with the decimals. I tried the formula but something is not adding up right.
anonymous
  • anonymous
the equation after the conversion is: (1/10)x+(9/10)y=-41/10 -> equation1 (6/10)x-(7/10)y=59/10 -> equation2 now choose one equation (either 1 or 2) and isolate one variable (4 example x). Try to isolate x from equation 1

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More answers

anonymous
  • anonymous
1/10x+9/10y=41/10
anonymous
  • anonymous
Because both equation 1 and 2 have the same denominator, you can simplify it. The equation system will look like this: x+9y=-41 -> equation1 6x-7y=59 -> equation2 Now isolating x from equation one, we get: x=-41-9y What is the next step to take?
anonymous
  • anonymous
I need your feedback man :)
anonymous
  • anonymous
thinking
anonymous
  • anonymous
6(-41-9y)-7y=59
anonymous
  • anonymous
Exactly! If we isolated x from equation 1, we have to replace this x (-41-9y) into equation 2. This is like a rule. For example, if you isolate x from equation 2, then you have to replace this x into equation 1. Now find the value for y
anonymous
  • anonymous
-246-45y-7y=59 -246-52y=59 -52y=305
anonymous
  • anonymous
oops math error i multiplied wrong
anonymous
  • anonymous
ok redo it and show me the correct answer.
anonymous
  • anonymous
y=5
anonymous
  • anonymous
exactly you got it. Now you have to replace this value (y=5) into either eq1 or 2 and you will find the x value. That is all you have to do my friend. Well done :) Sorry for my English :( my native language is spanish
anonymous
  • anonymous
im inserting the 5 for y but its not adding up right
anonymous
  • anonymous
let me check it out
anonymous
  • anonymous
y is not equal to 5, but -5
anonymous
  • anonymous
try with this value for y
anonymous
  • anonymous
Do you understand what substituting means?
anonymous
  • anonymous
I think so
anonymous
  • anonymous
I know you know but Im asking rich if he understands the concept of substituting.
anonymous
  • anonymous
no but im trying to
anonymous
  • anonymous
Well from the question you know that you are trying to solve for x and y but both of them have x and y in it which can be completely different so you want to essentially get a single variable x or y it doesnt matter in one equation and you solve for that one.
anonymous
  • anonymous
that is exactly what we have been doing :)
anonymous
  • anonymous
How can he understand what you are doing when he doesn't understand the concept. If you don't understand something and you work it out and find the answer it does no help since he is just memorizing it.
anonymous
  • anonymous
x=4
anonymous
  • anonymous
thanks
anonymous
  • anonymous
Yeah you are right romero. We had a discution about that before :). Rich you finally did it. If you replace x and y into the one of the original equation you have both sides are equal. Well done dude
anonymous
  • anonymous
thanks for the help
anonymous
  • anonymous
That is the procedure you have to follow
anonymous
  • anonymous
np

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