Question

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







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








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








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








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

Answer 1

Well first to find it, you want to get from the Standard version of the equation (Ax+By=C) which is where you have it now, to y-intercept version (y=mx+b) where b is the y intercept.
x+7y=-21
-x -x
7y=-x-21
/7 /7 /7
y=-1/7x-3
so the y intercept is -3. That narrows your answers down right to the last option,
x intercept=(-21,0) y intercept= (0,-3)