x+y=7 x-y=-1 cramers rule
Answers
Answered by
2
Step-by-step explanation:
The given equations are
x+y=7
x−y=5
D=
∣
∣
∣
∣
∣
∣
1
1
1
−1
∣
∣
∣
∣
∣
∣
=(1×−1)−(1×1)=−1−1=−2
D
x
=
∣
∣
∣
∣
∣
∣
7
5
1
−1
∣
∣
∣
∣
∣
∣
=(7×−1)−(1×5)=−7−5=−12
D
y
=
∣
∣
∣
∣
∣
∣
1
1
7
5
∣
∣
∣
∣
∣
∣
=(1×5)−(7×1)=5−7=−2
∴ By cramer's rule we get
∴ x=
D
D
x
=
2
−12
=6 and y=
D
D
y
=
2
−2
=1
Similar questions