x=-3 2x+y=3

To solve for \( y \) when \( x = -3 \) in the equation \( 2x + y = 3 \), follow these steps:

1. Substitute \( x \) with \(-3\): \[ 2(-3) + y = 3 \]

2. Calculate \( 2(-3) \): \[ -6 + y = 3 \]

3. Add 6 to both sides to isolate \( y \): \[ y = 3 + 6 \]

4. This simplifies to: \[ y = 9 \]

Thus, when \( x = -3 \), \( y = 9 \). The solution is \( (x,y) = (-3, 9) \).