What is the x-intercept of the equation 7x + 3y = 21?
Answer
A
(0, 3)
B
(0, 7)
C
(3, 0)
D
(7, 0)
Explanation
The x-intercept is where the graph crosses the x-axis, so y = 0. Substituting into 7x + 3y = 21 gives 7x = 21, so x = 3. The x-intercept is (3, 0), choice C.
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