Question

Find three solutions of the equation y=-3x

Answer 1

Let x be three different numbers, one at a time.
For each value of x, solve for y.

Answer 2

For example, if you let x = 5, then y = -3x = -3 * 5 = -15.
Then x = 5, y = -15 is one solution.
Now do the same for three other values of x.