Answer :
5x - 2y = -6 ⇒ 10x - 4y = -12
2x - 1y = 1 ⇒ 10x - 5y = 5
y = -17
5x - 2(-17) = -6
5x + 34 = -6
- 34 - 34
5x = -40
5 5
x = -8
(x, y) = (-8, -17)
2x + 3y = 432 ⇒ 10x + 15y = 2160
5x + 2y = 16 ⇒ 10x + 4y = 32
11y = 2128
11 11
y = 193.4545455
2x + 3(193.4545455) = 432
2x + 580.3636364 = 432
- 580.3636364 - 580.3636364
2x = -148.3636364
2 2
x = -74.1818182
(x, y) = (-74.1818184, 193.4545455)
2x - 1y = 1 ⇒ 10x - 5y = 5
y = -17
5x - 2(-17) = -6
5x + 34 = -6
- 34 - 34
5x = -40
5 5
x = -8
(x, y) = (-8, -17)
2x + 3y = 432 ⇒ 10x + 15y = 2160
5x + 2y = 16 ⇒ 10x + 4y = 32
11y = 2128
11 11
y = 193.4545455
2x + 3(193.4545455) = 432
2x + 580.3636364 = 432
- 580.3636364 - 580.3636364
2x = -148.3636364
2 2
x = -74.1818182
(x, y) = (-74.1818184, 193.4545455)
Answer:
A.
5x-2y= -6-------(1)
2x-y= 1------(2)
Equation (1) - 2 × Equation (2)
→5x-2y-4x+2y= -6 -2
Adding and Subtracting like terms
→x= - 8
Putting the value of x in equation 2
→2×(-8) -y =1
→-16 -y=1
Adding 16 on both sides of equation
→-y=16+1
→y = -17
x= -8, and y= -17
B
2x + 3y = 432------(3)
5x – 2y = 16---------(4)
2×Equation (3) + 3 × Equation (4)
→4x+6y+15x-6y=864+48
→19 x=912
Dividing both sides by 19, we get
x=48
Putting the value of x, in equation (3)
2× 48+3y=432
96+3y=432
3y=432-96
3y=336
Dividing both sides by,3 we get
y=112
Solution set is equal to, x=48,y=112
