I need to solve this by using the substitution method. Then graph.......please help. y=-x+1 2x-y=5
Subsititute in for 'y' in the second equation using the first: 2x - (-x + 1) = 5 2x + x + 1 = 5 3x + 1 = 5 3x = 5 - 1 3x = 4 x = 4/3
ok well u know what y equals..so plug in the answer for y! meaning u would plug this in.. 2x-(-x+1)=5
then you would solve from there!
ok thats what I got was x=4/3 but the book says (2,-1)
Did you try graphing the expressions?
no I don't know how
Your first equation is in y=mx + b format
oh ok I remember kinda how to do that......I will just have to look back in the book
Then turn your second equation to y= mx +b format too: 2x-y=5 -y = -2x + 5 y = 2x - 5
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