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

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

Thank you Reiny

1. To solve the linear system, you need to substitute the unknowns in one equation with the expressions given in the options and then solve for the remaining unknown. Let's look at each option:

A. Substitute 5x-16 for y in the first equation: This means replacing y in the first equation with the expression (5x-16). This gives you an equation solely in terms of x.

B. Substitute 5x+16 for y in the first equation: This means replacing y in the first equation with the expression (5x+16). This gives you an equation solely in terms of x.

C. Substitute 5x+12 for y in the first equation: This means replacing y in the first equation with the expression (5x+12). This gives you an equation solely in terms of x.

D. Substitute 7y-4 for x in the second equation: This means replacing x in the second equation with the expression (7y-4). This gives you an equation solely in terms of y.

To determine which substitution is proper, you need to evaluate which option results in an equation that can easily be solved for one of the unknowns. Once you have an equation with one unknown, you can substitute it back into one of the original equations to find the value of the other unknown.