2x + 3y=10
4 x. +. 2 y = 12
Answers
Answer:
Step-by-step explanation:
Ist :- 2x + 3y = 10
2
x
+
3
y
=
10
or
−
6
x
−
9
y
=
−
30
(after multiplying -3 (all terms)).
3
x
−
10
y
=
15
or
6
x
−
20
y
=
30
(after multiplying 2 (all terms)).
Add them:
−
6
x
−
10
y
=
−
30
6
x
−
20
y
=
30
−
30
y
=
0
y
=
0
Use the first equation to find x:
2
x
+
3
y
=
10
2
x
=
10
(because y is zero)
x
=
10
2
=
5
2nd answer :-4 x. +. 2 y = 12
Explanation:
4
x
+
2
y
=
12
........equation
(
1
)
x
+
2
y
=
6
..............equation
(
2
)
Solving by elimination:
Subtracting equation
2
from
1
eliminates
2
y
4
x
+
2
y
=
12
−
x
−
2
y
=
−
6
3
x
=
6
x
=
6
3
x
=
2
Finding
y
from equation
1
:
4
x
+
2
y
=
12
2
y
=
12
−
4
x
2
y
=
12
−
4
⋅
2
2
y
=
12
−
8
2
y
=
4
y
=
4
2
y
=
2
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