Question

the pair of equation 7x+3y-5=0 and -21x-9y+15=0 have​

Answer 1

Answer:

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Answer 2

Answer:

Given equations are:

x+2y=5 ---(1)

7x+3y=13 ---(2)

Multiplying equation (1) by 7

7x+14y=35 ---3)

Subtracting equation (2) from equation (3), we have

11y=22

y=2

Now putting y value in equation (1)

⇒x+2(2)=5

⇒x=5−4

⇒x=1

x=1,y=2

1) Graphically, the pair of equations 7x – y = 5; 21x – 3y = 10 represents two lines which are

(a) intersecting at one point

(b) parallel

(c) intersecting at two points

(d) coincident

Answer: b

Hope it helps you!