Question

1.5x+0.1y=6.2; 3x-0.4y=11.2

Answer 1

Multiplying (i)and(ii) Equation with 10

We will get:

15x+1y=62-(i)

30x-4y=112-(ii)

Multiplying (i)Eq by 2 and (ii)Eq by 1 We get,

30x+1y=62

30x-4y=112

(-) (+) (-) {Sign will be changed}

^^^^^^^^^^

0-4y=-50 {Minus and Minus will be cutted}

4y=50

y=50/4

Answer: y=12.5

Putting value of y=12.5 in (1)Eq we get,

15x+1(12.5)=62

15x+12.5=62

15x=62-12.5

15×=49.5

x=49.5/15

Answer: x=3.3

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