SOLUTION: i couldnt figure out how to work this problem. im in 9th grade in algebra 1. what is
y=4x-8
y=2x+10
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Question 176227: i couldnt figure out how to work this problem. im in 9th grade in algebra 1. what is
y=4x-8
y=2x+10
Found 3 solutions by Alan3354, nerdybill, jim_thompson5910:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
i couldnt figure out how to work this problem. im in 9th grade in algebra 1. what is
y=4x-8
y=2x+10
------------
It's not the usual method, but since they both equal y:
4x-8 = 2x+10
2x = 18
x = 9
---------
y = 4*9-8
y = 28
We're done.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
y=4x-8 (equation 1)
y=2x+10 (equation 2)
.
Plug in the value of 'y' from equation 1 into equation 2 and solve for 'x':
y=2x+10
4x-8=2x+10
2x-8 = 10
2x = 18
x = 9 (solution for x)
.
Plug the above into equation 1 and solve for 'y':
y=4x-8
y=4(9)-8
y=36-8
y=28 (solution for y)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the first equation.
Plug in (which is the second equation). In other words, replace each "y" with to eliminate the y variable.
Subtract from both sides.
Subtract from both sides.
Combine like terms on the left side.
Combine like terms on the right side.
Divide both sides by to isolate .
Reduce.
-----------------------------------
Go back to the first equation.
Plug in
Multiply
Subtract
==================================================
Answer:
So the solutions are and which form the ordered pair (9,28)
So the system is consistent and independent.
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