Question

If 6x - 3y = 30 and 4x = 2 - y then find x + y.

Answer 1

6x-3y-30=0
4x+y-2=0
-----------
6x-3x-30=0
12x+3y-6=0 +
------------
18x=36
x=2
------------
12*2+3y-6=0

Answer 2

3y=-18
y=-6

Answer 3

x+y=?
2+(-6)=-4

Answer 4

:)

Answer 5

ok im confused where did 6x-3x-30 come from?
12+3y-6

Answer 6

6x - 3y = 30 => 6x-3x-30=0
4x = 2 - y => 4x+y-2=0

Answer 7

4x+y-2=0 (multiplying by 3) makes 12x+3y-6=0

Answer 8

ok i was just confused because you keep typing 3x up at the top instead of 3y but i get it now thanks

Answer 9

sry..now i see.. it was supposed to be 6x-3y-30=0

Answer 10

You re-arrange the equation and you'll have
6x-3y-30=0
4x+y-2=0
Solve using elimination method in simultaneous equation

multiply the first line by 6 and the second line by 4 and we'll have

4 (6x-3y-30)=0
6(4x+y-2)=0

=

24x -12y-120=0 ----Equation 1
24x +6y -12=0 ---Equation 2

Subtract equation 2 from equation 1

-18y-108=0
-18y=108
y= - 108/18
y= -6

Substitute the value for y in 6x-3y-30=0 to find x

6x-3(-6)-30=0
6x+18-30=0
6x-12=0
6x=12
x=12/6
x=2

x+y = 2+(-6)=2-6= -4

Hope this helps