Math

I need help with finding an equation to a line.
Its finding an equation with the intercepts x=-1 and y=3.
Ive gotten the slope of -3 but i don't know where to go from there......

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  1. The x-intercept are where the graph crosses the x-axis, and the y-intercept are where the graph crosses the y-axis.

    an x-intercept is a point in the equation where the y-value is zero,

    and

    a y-intercept is a point in the equation where the x-value is zero.

    x-intercept:

    x = -1 and y = 0

    y-intercept:

    x = 0 y = 3

    Two-point form of the linear equation:

    y - y1 = [( y2 - y1 ) / ( x2 - x1 ) ] * ( x - x1 )

    where (x1,y1) and (x2,y2) are two points on the line with x2 �‚ x1.

    In this case:

    x1 = - 1

    y1 = 0

    x2 =0

    y2 = 3

    So:

    y - y1 = [( y2 - y1 ) / ( x2 - x1 ) ] * ( x - x1 )

    y - 0 = [( 3 - 0 ) / ( 0 - ( -1 ) ] * ( x - ( - 1 )

    y = ( 3 / 1 ) * ( x + 1)

    y = 3 * ( x + 1 )

    y = 3x + 3

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  2. x+2y+z=1
    -x+y+2=6
    4x-y+3z=-1

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