Substitute back to find \(y\): \(y = 4(1.5) - 5 = 1\).
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- Substitute into the first equation: \(2x + 3(4x - 5) = 6\).
- Simplify: \(2x + 12x - 15 = 6\), so \(14x = 21\).
- Solve: \(x = 1.5\).
- #### \(x = 1.5\), \(y = 1\)
- If the sum of the first \(n\) natural numbers is given by \(\frac{n(n+1)}{2}\), find \(n\) when the sum is 210.
- Set up the equation: \(\frac{n(n+1)}{2} = 210\).
