L19. Solve: 3x + y = 15
2x - y=5
Answers
Answered by
1
Add both the equations
3x+y=15
+2x-y=5
(+) (-) (+)
5x=20
Therefore x=20/5=4
Put x=4 in 2x-y=5
Therefore 2(4)-y=5
8-y=5
-y=5-8=-3
Therefore
y=3
Solution: the solution of the equation is (x,y)=(4,3)
3x+y=15
+2x-y=5
(+) (-) (+)
5x=20
Therefore x=20/5=4
Put x=4 in 2x-y=5
Therefore 2(4)-y=5
8-y=5
-y=5-8=-3
Therefore
y=3
Solution: the solution of the equation is (x,y)=(4,3)
Answered by
0
Answer:
3x+ y=15
xy=15÷3
xy=5
2x-y=5
xy=5÷2
xy=2.5
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