d) \( 3 x+y=-9 \) \( 4 x-3 y=1 \)
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Bonus Knowledge
To solve this system of equations, you can use the elimination or substitution method. Let’s opt for the substitution method. First, solve the first equation for \( y \): \( y = -9 - 3x \). Now, substitute this expression for \( y \) in the second equation \( 4x - 3(-9 - 3x) = 1 \). After simplifying and solving for \( x \), you'll find the value of \( x \), and then you can plug it back to find \( y \). After solving, you'll get \( x = 2 \) and \( y = -15 \). So, your solution is \( (2, -15) \). You can also check your solution by plugging these values back into the original equations to ensure they both hold true!