Algebra 1

1.To solve the linear system below, which substitution of unkowns is proper ?
A.substitute 5x-16 for y in the first eqn
B.substitute 5x+16 for y in the first eqn
C.substitute 5x+12 for y in the first eqn
D.substitute 7y-4 for x in the second eqn

2.A line with a slope of -2 passes through the point (-2,4). If (c,-2) is another point on the line, what is the value of c?

3. Use lines with equations x+5y=5 and 5x + py = 5. a.Find p if the lines are parallel. b.Find p if the lines are perpendicular.

4.Write an equation in standard form of a line that is perpendicular to the line that passes through the points (-3,-8) and (-2,5) ?

5.Which pair of lines are parallel?
k:4x-y=-3 L:-4x-5=y
m:5y=3x+35 n:10y+20=6x
choices: A.k and m B.L and m C.k and n
D.n and m
PLEASE HELP a.s.a.p

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  1. 2.
    so the slope between (-2,4) and (c,-2) must be -2
    (-2-4)/(c+2) = -2
    -6 = -2c - 4
    c = 2

    3. slope of x+5y = 5 is -1/5
    slope of 5x + py = 5 is -5/p
    -5/p = -1/5
    p = 25

    4. slope for the 2 given points = (5+8)/(-2+3) = 13
    y-5 = 13(x+2)
    y = 13x + 31
    OR
    13x - y = -31

    5. try it
    see which pair has the same slope

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  2. Thank you Reiny

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