Question

solve 9x - 4Y=20 and 7x-3Y=20 by elimination method​

Answer 1

Step-by-step explanation:

pls mark brainliest and follow

Answer 2

The value of x and y is x=20 and y=40.

Given:

9x - 4y = 20

7x - 3y = 20

To Find:

To solve 9x - 4y = 20 and 7x - 3y = 20 by elimination method.

Solution:

Let's assume, $9x-4y=20$ as equation (i)

and $7x-3y=20$ as equation (ii)

now, multiply eq.(i) by 3

$(9x\times 4y=20)\times 3$

we get, $27x\times 12y=60$ as equation (iii)

now, multiply eq.(ii) by 4

$(7x-3y=20)\times 4$

we get, $28x-12y=80$ as equation (iv)

now, after subtracting the equation (iv) and (iii)

$28x-12y=80\\27x-12y=60$

we will get the value of $x=20$

now, put the value $x$ in equation (i)

$9x-4y=20\\9\times 20-4y=20\\180-4y=20\\4y=180-20\\y=40$

here we get, the value of $y=40$ and $x=20$.

Thus, the value of x and y is x=20, y=40.