Select the correct statement about f(x) = 5x - 9.
1) Translating f(x) horizontally by 5 changes the y-intercept to 16.
2) Translating f(x) vertically by -3 does not change the y-intercept.
3) Horizontally stretching f(x) by 3 changes the slope to 8.
4) Vertically stretching f(x) by 2 changes the slope to 10.