Question

x+y=7
3x-y=7
2x +y = 8
x+2y=7
find the solutions for pair of linear equation by graphical method​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

1) x+y=7 .... Rearranging

x=7-y ....(1)

(i)When y=4 (ii)When y=2 (iii)When y=-1

x=7-y x=7-y x=7-y

x=7-4 x=7-2 x=7-(-1)

x=3 x=5 x=7+1

x=8

(iv)When y=6

x=7-y

x=7-1

x=6

2) 3x-y=1 .... Rearranging

y=1-3x ....(2)

(i)When x=1 (ii) When x=2 (iii)When x=-1

y=1-3x y=1-3x y=1-3x

y=1-3(1) y=1-3(2) y=1-3(-1)

y=1-3 y=1-6 y=1+3

y=-2 y=-5 y=4

(iv)When x=3

y=1-3x

y=1-3(3)

y=1-9

y=-8

3)2x+y=8 .... Rearranging

y=8-2x ....(3)

(i)When x=4 (ii)When x=3 (iii)When x=-1

y=8-2x y=8-2x y=8-2x

y=8-2(4) y=8-2(3) y=8-2(-1)

y=8-8 y=8-6 y=8-(-2)

y=0 y=2 y=8+2

y=10

(iv)When x=2

y=8-2x

y=8-2(2)

y=8-4

y=4

4)x+2y=7 .... Rearranging

x=7-2y .....(4)

(i)When y=4 (ii)When y=3 (iii)When y= -1

x=7-2y x=7-2y x=7-2y

x=7-2(4) x=7-2(3) x=7-2(-1)

x=7-8 x=7-6 x=7+2

x=-1 x=1 x=9

(iv)When y=5

x=7-2y

x=7-2(5)

x=7-10

x=-3

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