Q: Use the equation y = 3x + 1. Find y for x = 1, 2, 3, and 4.
A: This is really four questions in one! We have to:
(a) Find y when x=1
(b) Find y when x=2
(c) Find y when x=3
(d) Find y when x=4
For part (a), plug x=1 into the equation:
y = 3x + 1
y = 3(1) + 1
y = 3 + 1
y = 4
Similarly, for part (b) plug x=2 into the equation:
y = 3x + 1
y = 3(2) + 1
y = 6 + 1
y = 7
Same for parts (c) and (d):
(c): When x=3 we have:
y = 3x + 1
y = 3(3) + 1
y = 9 + 1
y = 10
(d) When x=4, we have:
y = 3x + 1
y = 3(4) + 1
y = 12 + 1
y = 13