Algebra: Check please!!!

1. Find the x-intercept and the y-intercept of 8x - 2y = -24.
a. x= -7, y= 2
b. x= -4, y= 14
c. x= -3, y= 12
d. x= -7, y= -2
answer: a

Find the x- and y- intercept of the line 2x + 3y = -18.
a. x-intercept is 18, y-intercept is 18
b. x-intercept is -6, y-intercept is 9.
c. x-intercept is 2, y-intercept is 3.
d. x-intercept is -9, y-intercept is -6.
amswer c

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  1. They are both incorrect.

    To find the x-intercept of the line
    L : ax + by + c = 0
    you would set y=0, (that is, where the line intersects the x-axis) and solve for x in :
    ax + b(0) + c =0

    To find the y-intercept, you would similarly set x=0, where L intersects the y-axis, and solve for y:
    a(0) + by + c =0

    Try the problems using the above methods and post your answers for checking if you wish.

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  2. what is the intercept form of -3x+3y=15

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