Posted by Ley on Thursday, April 18, 2013 at 7:29pm.
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?
choices: A.k and m B.L and m C.k and n
D.n and m
PLEASE HELP a.s.a.p
Algebra 1 - Reiny, Thursday, April 18, 2013 at 8:28pm
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
13x - y = -31
5. try it
see which pair has the same slope
Algebra 1 - Ley, Friday, April 19, 2013 at 10:05am
Thank you Reiny
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