Question

OY-
andy
$2x + y = 7 \\ x - 2y = 4$
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Answer 1

Step-by-step explanation:

2x + y = 7

x - 2y = 4

Here, I'm gonna to solve it by Elimination method as it's easy to apply here.

Elimination method:

2x + y = 7 ........ (i)

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

Multiplying equation (i) by 2 we obtain,

4x + 2y = 14 ...... (iii)

Adding equation (i) and (iii),

4x + 2y = 14

+ x - 2y = 4

_______________

5x = 18

$\boxed{\mathsf{x = \frac{18}{5}}}$

Substituting x = 18/5 in equation (ii),

x - 2y = 4

$\frac{18}{5} - 2y = 4$

$\frac{18 - 10}{2} - 2y = 4$

$\frac{8}{2} - 2y = 4$

$\frac{\cancel{8}}{\cancel{2}} - 2y = 4$

4 - 2y = 4

-2y = 4 - 4

-2y = 0

$\boxed{\mathsf{y = 0}}$

Therefore, 18/5 and 0 are the solutions for the given equations.

Answer 2

Step-by-step explanation:

Hey mate i will help u

We can solve this by substitution method

We get

$y = 0$

$put \: y = 0 \: in \: any \: equation$

$x - 2y = 4 \\ x - 2(0) = 4 \\ \\ x = 4$