Question

Identify the correct x intercept and y intercept of the equation x + 7y = -21.

x intercept = (3, 0); y intercept = (0, 21)

x intercept = (-3, 0); y intercept = (0, -21)

x intercept = (21, 0); y intercept = (0, 3)

x intercept = (-21, 0); y intercept = (0, -3)

Answer 1

15x-5y = 30
-5y = 30-15x
y = 3x-6

y = 3(0)-6
y = 0-6
y = -6, (0,6)

(0) = 3x-6
0 = 3x-6
-3x = -6
x = 2, (2,0)

Solution: x-intercept = (2,0); y-intercept = (0,-6)