SOLUTION: c/2-d/5=-4 and c-d/5=-8 solve by substitution method

Question 126976This question is from textbook algebra structure&method book 1
:
c/2-d/5=-4 and c-d/5=-8 solve by substitution method This question is from textbook algebra structure&method book 1

Found 2 solutions by josmiceli, checkley71:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I notice that is common to both

add to both sides

add 8 to both sides

substitute this into

answer

answer

Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
C-D/5=-8 OR C=D/5-8 OR C=(D-40)/5
[(D-40)/5)]/2-D/5=-4
(D-40)/5*1/2-D/5=-4
(D-40)/10-D/5=-4
(D-10-2D)/10=-4
(-D-10)/10=-4
-D-10=-40
-D=-40+10
-D=-30
D=30 ANSWER.
C-(30/5)=-8
C-6=-8
C=-8+6
C=-2 ANSWER.
PROOF:
-2-30/5=-8
-2-6=-8
-8=-8

RELATED QUESTIONS
CRAMER RULE, ELIMIATION OR SUBSTITUTION METHOD, AND MATRICES PRACTICE PROBLEMS 1. (answered by richard1234)
Solve the system by substitution. 2x-y+z=-4 z=5 -2x+3y-z=-10... (answered by ewatrrr)
Solve -4/5x=-2 a -5/2 b -8/5 c 8/5 d... (answered by mananth)
Solve 3x+y=-3 and y=x+5 by using substitution. Express your answer as an ordered pair.... (answered by MathLover1)
Solve by using substitution method. 1.) c=3d-4 & c+d=16 2.) 3a=2b-6 & a=b-1 3.)... (answered by Alan3354)
Solve by substitution: y=-1-4x 20x+5y=-5 A. (�5, 1) B. No solution C. (answered by josgarithmetic,MathTherapy)
Solve this system of equations using any method. 3x � y = 4 x + 2y = 13 A. (3, (answered by stanbon)
If a=2,b=3,c=4,d=5:solve... (answered by ValorousDawn)
Solve the system by substitution: x + y = 6 and x - y = 10. Show work. A (-8, -1) B... (answered by lynnlo)