Question

2 - 4x + 4y and 2y += 3x + 13
please help. I have a test in a few hrs and i still dont understand equations ;-;

Answer 1

It said to solve the following simultaneously

Answer 2

Your first equation is incomplete, there should be an equals sign, we need to know where it is to help solve.

Answer 3

oh oops its 2 - 4x = 4y

Answer 4

and the 2nd one is 2y = 3x + 13

Answer 5

solve first one for x then put the value of the x in the second equation to find the value of y..... then use any equation to solve for x using the value of y

Answer 6

umm so 4x = 4y + 2?

Answer 7

then, 3( 4y + 2) = 2y

Answer 8

2 - 4x = 4y and 2y = 3x + 13

Firstly, take the first equation, divide both sides by 4 then you will get :
0.5 - x = y
Then plug this into the second equation you will get : 2(0.5-x) = 3x+13
which is : 1 - 2x = 3x + 13
get the -2x from the left hand side to the right hand one you will get :
1 = 5x + 13
the solving for x you will get : x = -12/5 which is -2.4
then substituting back by x = -2.4 into y = 0.5 - x you will get y which will be :
y = 0.5 - (-2.4) = 0.5 + 2.4 = 2.9
Let me know if you got it :)

Answer 9

Ahhh i get it now. Thankyou so much, also does this method apply to all of these simultaneous equations?

Answer 10

Yes just apply these few simple steps carefully and you will get a full mark in all the questions of this type :)

Answer 11

thankyou so so much :D

Answer 12

You are welcome ^_^
Feel free to ask me at any time you like :D