complete the following activity to solve the simultaneous equations 3x+2y=31and 7x-2y=39
Answers
Answered by
2
Answer:
3x + 2y = 6
2x + 4y = 12
D = 13 321=(3*4)-(2*2)=12-4=8 12 41
Dx = 16 21=(6*4)-(2*12)=24-24=0
| 12 41
Dy = 13 6 1=(3*12)-(6*2)=36-12=
24
12 12 1
X = DX/D = 0/8 = 0
Y = Dy/D = 24/8 = 3
Explanation:
Hope it Help You
Answered by
4
Answer:
Explanation:
Eq 1- 7x - 2y = 39
Eq 2- 3x + 2y = 31
Add both the equation
7x - 2y = 39
+ 3x + 2y = 31
10x = 70
x = 70/10
x = 7
substitute value of x in eq 2
3(7) + 2y = 31
21 + 2y = 31
2y = 31 - 21
2y = 10
y = 10/2
y = 5
Therefore, x = 7, y = 5
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