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calculusxy
 one year ago
Solving Systems of Equations by Substitution.
1.
3x + 3y = 4
x + y = 3
2.
5x  8y = 17
2x  7y = 17
calculusxy
 one year ago
Solving Systems of Equations by Substitution. 1. 3x + 3y = 4 x + y = 3 2. 5x  8y = 17 2x  7y = 17

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calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1@jim_thompson5910 @Nnesha

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1This is my work for question 1. we could figure out the value of y by: y = 3 + x 3x + 3(3 + x) = 4 is that correct?

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1i need to solve for x, which i know, but i just wanted to know whether my set up was fine or not.

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1so then we can simply it to: 3x + 9 + 3x = 4

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1but if we do 3x + 3x = 0x and I am not even sure if there is any such thing as 0x.

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2thats mean no solution both sides are not equal \[9 \cancel =4\]

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1and for the next one...

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1we can figure out the value of x... 2x  7y = 17 2x = 17 + 7y 2x / 2 = (17 + 7x) / 2 x = 8.5 + 3.5x

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2hmm you mean x = 8.5 +3.5 y right ?

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.15(8.5 + 3.5y)  8y = 17

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.142.5  17.5y  8y = 17 42.5  25.5y = 17 25.5  25.5y = 17 25.5y = 42.5 y = 1.67 i am pretty sure i am wrong it's going on decimals.

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2well i don't understand the 3rd line

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1if i did 17  42.5 = 25.5

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2yep that's right you need to move 42.5 to the right side then you will get Perfect one

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1what do you mean by moving 42.5?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2i meant you have to subtract 42.5 both sides :=)

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1so what i did was correct right?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2\(\color{blue}{\text{Originally Posted by}}\) @calculusxy 42.5  17.5y  8y = 17 42.5  25.5y = 17 25.5  25.5y = 17 25.5y = 42.5 y = 1.67 i am pretty sure i am wrong it's going on decimals. \(\color{blue}{\text{End of Quote}}\) well here 3rd line you need to subtract 42.5 both sides i don't why there is 25.5 25.5y

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1and then we would do: 5x  8(1) = 17 5x  8 = 17 5x = 25 x = 5

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1thanks :) I have another question. it's small and related to basic physics. can u help?

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1can u just see it? if u can't do it then u don't have to.

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1okay. here it is...

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1If i'm driving in a car at 30kph and a friend is driving in a car with the same mass at 60kph, my friend's car's kinetic energy is bigger than mine by a factor of what? (that is, divide my friend's over mine.)

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.2i'm not sure havn't done physics n a while sorry

calculusxy
 one year ago
Best ResponseYou've already chosen the best response.1okay thank you though :)
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