Math and Arithmetic

Algebra

Calculus

# 5x - 9y -3?

###### Wiki User

###### 2009-01-18 21:05:51

(x+5)(x+5)

## Related Questions

###### Asked in Math and Arithmetic, Algebra, Calculus

### 5x plus 9y equals 0 6x plus 6y equals 2?

5x + 9y = 0
6x + 6y = 2 use substitution method
5x + 9y = 0
y = -5x/9
6x + 6y = 2 substitute y with -5x/9
6x + 6(-5x/9) = 2
6x - 30x/9 = 2 multiply by 9 to both sides
54x - 30x = 18
24x = 18
x = 24/18 = 4/3
y = -5x/9 = (-5/9)x substitute x with 4/3
y = (-5/9)(4/3) = -20/27
Thus the solution is x = 4/3 and y = -20/27.

###### Asked in Math and Arithmetic, Algebra, Proofs

### Is this equation solvable 3x plus 4y-6c equals -7 and x plus 9y equals 19 and 5x-y equals 3?

YES : Equation (1) 5x - y = 3
x + 9y = 19 : Multiply by 5 →Equation (2) 5x + 45y = 95
Subtract Equation (1) from Equation (2) to eliminate 'x' terms.
This gives : 45y -(-y) = 95 - 3 : 46y = 92 : y = 2
Substituting for y in Equation(1) gives : 5x - 2 = 3 : 5x = 3 +
2 = 5 : x = 1
Substituting for x and y in the equation 3x + 4y - 6c = -7 gives
: 3 + 8 - 6c = -7 : 6c = 11 + 7 = 18 : c = 3