Question

2x + y = 4 Equation 1 x – 2y = 7 Equation 2 Solve using the three methods. *

Answer 1

Answer:

$1) x= \frac{4-y}{2}$

$2)x=7+2y$

Step-by-step explanation:

$\red{i) 2x+y=4}$

$\Rightarrow 2x+y-y=4-y$

$\Rightarrow 2x =4-y$

$\Rightarrow \frac{2x}{2}=\frac{4}{2}-\frac{y}{2}$

$\Rightarrow x=\frac{4-y}{2}$

$\boxed{x=\frac{4-y}{2}}$

___________________________

$\red{ii) 1x-2y=7}$

$\Rightarrow x-2y=7$

$\Rightarrow x-2y+2y=7+2y$

$\Rightarrow x=7+2y$

$\boxed {x=7+2y}$