SOLUTION: Please help me with this problem SOlve by substitution: b = -2c + 4 2c + b = 4

Question 73447This question is from textbook
: Please help me with this problem
SOlve by substitution:
b = -2c + 4
2c + b = 4 This question is from textbook

Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
SOlve by substitution:
b = -2c + 4-----------------------------eq1
2c + b = 4--------------------------------eq2
Substitute b=-2c+4 from eq1 into eq2 and we get:
2c-2c+4=4
0+4=4
This system of equations has no solution. Why???????????????
Because b=-2c+4 and 2c+b=4 are the same, identical equation
Lets look at eq1
b=-2c+4 add 2c to both sides
b+2c=-2c+2c+4 collect like terms
b+2c=4 or 2c+b=4-----------------same as eq2

Hope this helps----ptaylor

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