Question

Y=2x+1 x+y=7 pls help meeeeeeeee

Answer 1

Answer:

$y=2,\:x=\frac{5}{2}$

Step-by-step explanation:

$\begin{bmatrix}x+1\cdot \:x+y=7\\ y=2\end{bmatrix}$

x+1· x+2=7

Simplify x+1· x+2:    2x+2x+1· x+2

Add similar elements: x+1· x=2x=2x+2

2x+2=7[ 2x+2=7 ]

Isolate x for 2x+2=7:    x=52 2x+2=7

Subtract 2 from both sides

2x+2−2=7−2

Simplify

2x=5

Divide both sides by 2

2x2 =52 Simplify

Answer 2

Answer:

$y = 2x + 1 \\ substitute \: for \: y \: in \: x + y = 7 \\ x + (2x + 1) = 7 \\ 3x = - 6 \\ x = - \frac{1}{2} \\ y = 2( - \frac{1}{2} ) + 1 \\ y = - 1 + 1 \\ y = 0$