If y-3=7 and x+3y=6 then x=?Show your work.
8 Answers
jlcannad | High School Teacher | (Level 2) Assistant Educator
I can't answer x+3y=6 right now. I have two variables (x and Y) so I'm stuck.
So, I turn to my other equation. y-3=7. If I add three to each side of the equation, I get y=10.
Now that I know y=10, I can put the number 10 in every place there was a "y." So, the second equation looks like this...
x+3y=6
x+3(10)=6
x+30=6 So I subtract 30 from each side.
x=-24
I then check myself by putting all my numbers back into the original equations.
10-3=7 and -24+3(10)=6
Yep, that works.
malkaam | Student, Undergraduate | (Level 1) Valedictorian
y-3=7-----(i)
x+3y=6----(ii)
x=?
In order to find the value of x we must first find the value of y, to do that let us first consider equation (i): y-3=7
y-3=7-----(i)
y-3+3=7+3 (adding 3 on both sides)
y=10
Then, we input the value of y in equation (ii): x+3y=6
x+3y=6
Input the value of y in this equation i.e 10
x+3(10)=6
x+30-30=6-30 (subtract 30 from both sides)
x= -24 Answer.
jess1999 | Student, Grade 9 | (Level 1) Valedictorian
If y-3=7 and x+3y=6 then x=?
First let's find what " y " equals
y - 3 = 7 add 3 on both sides
By adding, you should get
y = 10 which is what " y " equals
Now plug 10 into the equation
x + 3 ( 10 ) = 6 multiply 3 with 10
By multiplying, you should get
x + 30 = 6 now subtract 30 on both sides
By subtracting, your equation should look like
x = -24 which Is your answer
acompanioninthetardis | Student, Undergraduate | (Level 1) Valedictorian
If y-3=7 and x+3y=6 then x=
we need ot get the unkown variables by themselves, and usually you start with the equation that only has one unknown variable, wheich would be y-3=7
you add three to both sides so the -3 goes away leaving you with the value of y
y=10
then you plug this value into the other equation x+3y=6
to give you X+ 3(10) = 6
X+30=6
then you do the same thing, you try to get the 30 onto the right side by subtracting 30 from both sides so it gives you the value of X
X= -24
atyourservice | Student, Grade 11 | (Level 3) Valedictorian
y-3=7 and x+3y=6 then x=
y - 3 = 7
+3 +3
y=10
plug in the number in the second problem
x+3(10)=6
x+30=6
-30 -30
x= -24
Wiggin42 | Student, Undergraduate | (Level 2) Valedictorian
If y-3=7 and x+3y=6 then x=?
First solve for y because we have enough information for that.
y = 3 + 7 = 10
plug into the other equation:
x + 3(10) = 6
x + 30 = 6
x = 6 - 30 = -24
Jyotsana | Student, Grade 10 | (Level 1) Valedictorian
y-3=7
y-3+3=7+3
y=10
x+3y=6
x+3(10)=6
x+30=6
x+30-30=6-30
x=-24
emplay | Student, Grade 11 | eNotes Newbie
Well
x+3y=6 and y-3=7
(+3)y-3=7(+3)
y=10
x+3(10)=6
x+30=6
x= -24