SOLUTION: -15x+7y=1
3x-y=1
Algebra.Com
Question 859689: -15x+7y=1
3x-y=1
Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
-15x+7y=1
3x-y=1
.
In the second equation, isolate y by subtracting 3x from each side.
-y = 1-3x
Multiply each side by -1
y = 3x-1
.
Substitute the known value of Y into the first equation.
-15x + 7(3x-1) = 1
Distribute
-15x +21x - 7 = 1
Add Xs
6x -7 = 1
Add 7 to each side
6x = 8
Divide
x = 8/6
.
If x = , then y=3x-1, or -1, or 4-1, or 3.
.
Let's put the numbers back into the first equation to see if it works.
-15x+7y=1
-15( + 7(3) = 1
- + 21 = 1
-20 + 21 = 1
Success!
RELATED QUESTIONS
3x+5=1/5(15x+10 (answered by Fombitz)
15x^4+3x^3-7x^2/3x^2+1 (answered by Fombitz)
7y-15x=22... (answered by Alan3354)
3x+7y=19... (answered by Alan3354,fractalier)
Solve by the addition method
5x-2y= -1
7y= 24 -3x
This is what I have tried:
I... (answered by rfadrogane)
Can these be done?
3x^2 + 15x + 18 = 0
1 + 3y/y-2 =... (answered by rchill)
6x^7y^5/3x^-1 (answered by JenniferTutors)
21(1/3x+6/7y) (answered by checkley79)