Using the x-intercept concept, the function has x-intercept of 4 when c = -2.
The x-intercepts of a function are the values of x when y = 0.
In this problem, the function is:
cx - 5y + 8 = 0.
When y = 0, we have that:
cx + 8 = 0
x = 4, hence:
4c = -8
c = -2.
More can be learned about x-intercepts at https://brainly.com/question/24388356
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