SOLUTION: Sir i need u help at the earliest . 1. Solve by elimination method:- 4x+5y=6 2/3x-5y=7 2.Solve by substitution method:- 5x+6y=7 7/8x+9/10y=3/4 thank u ........

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations -> SOLUTION: Sir i need u help at the earliest . 1. Solve by elimination method:- 4x+5y=6 2/3x-5y=7 2.Solve by substitution method:- 5x+6y=7 7/8x+9/10y=3/4 thank u ........      Log On

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Question 111177: Sir i need u help at the earliest .
1. Solve by elimination method:-
4x+5y=6
2/3x-5y=7
2.Solve by substitution method:-
5x+6y=7
7/8x+9/10y=3/4
thank u ........
Answer by solver91311(12126) About Me  (Show Source):
You can put this solution on YOUR website!
I'll do one, you try the other one, and write back if you are still having trouble.
:
4x%2B5y=6
%282%2F3%29x-5y=7
:
Using the first equation, solve for y:
:
5y=6-4x
y=%286-4x%29%2F5
:
Now substitute this value for y into the second equation:
:
%282%2F3%29x-5%28%286-4x%29%2F5%29=7
:
%282x%29%2F3-6%2B4x=7
%282x%2B12x%29%2F3=7%2B6
14x=39
x=39%2F14
:
Now substitute this value of x into the first equation:
:
4%2839%2F14%29%2B5y=6
78%2F7%2B5y=6
5y=42%2F7-78%2F7
y=-36%2F35
:
Check:
%282%2F3%29%2839%2F14%29-5%28-36%2F35%29=13%2F7%2B36%2F7=49%2F7=7
4%2839%2F14%29%2B5%28-36%2F35%29=78%2F7-36%2F7=42%2F7=6, Check
:
Ok, the next one is yours. Like I said, write back if you are still having trouble. Just remember to be very careful with your signs and with the arithmetic in general.