Answer :
Answer:
y=3 x=3
Step-by-step explanation:
use substitution method :
3x-y=6-------(1)
6x+y=21------(2)
from (2),
6x+y=21
y=21-6x------(3)
substitude (3) inside (1)
3x-y=6
3x-(21-6x)=6
3x-21+6x=6
9x=27
x=3
if x = 3
from (1),
3x-y=6
3(3)-y=6
9-y=6
-y=-3
y=3
Answer:
(3, 3 )
Step-by-step explanation:
Given the 2 equations
3x - y = 6 → (1)
6x + y = 21 → (2)
Adding (1) and (2) term by term will eliminate the term in y, that is
(6x + 3x) + (y - y) = (21 + 6)
9x = 27 ( divide both sides by 9 )
x = 3
Substitute x = 3 into either of the 2 equations and solve for y
Using (2), then
(6 × 3) + y = 21
18 + y = 21 ( subtract 18 from both sides )
y = 3
Solution is (3, 3 )