How do you find the intercepts for #3x + 9y = 18?

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Answer 1 · 2015-07-03T19:25:13

To find the x-intercept, substitute 0 for y, then solve for x.
To find the y-intercept, substitute 0 for x, then solve for y.

$3x+9y=18$

X-Intercept

Substitute $0$ for $y$ .

$3x+9(0)=18$

$3x=18$

Divide both sides by $3$ .

$x=6$

Y-Intercept

Substitute $0$ for $x$ .

$3(0)+9y=18$

$9y=18$

Divide both sides by $9$ .

$y=2$

graph{3x+9y=18 [-10, 10, -5, 5]}