(x + 5 ) 10 - 20 = 10x +50 -20 = 10 x +30 = 10 ( x+3 )
we drop the zero
x + 3 = 9
x= 9- 3= 6
Answer:
Step-by-step explanation:
"One number is eight less than a second number."
x = y-8
"Twice the first is 12 more than 4 times the second."
2x = 4y+12
substitution
2(y-8) = 4y + 12
2y - 16 = 4y + 12
2y = -28
y = -14
x = y-8 = -22
Answer:
One solution: 0x + 0.5y = 0
Step-by-step explanation:
9x + 4y = 36
6x + 2.5y = 24
2 * Eq. 1
18x + 8y = 72
-3 * Eq. 2
-18x - 7.5y = -72
Add the multiples of the equations.
0x + 0.5y = 0
Answer: One solution: 0x + 0.5y = 0
Solve -21/4 divided by 11/4. (-21 divided by 4)
Answer:
-x^2 + 8x - 16.
Step-by-step explanation:
That would be -1(x - 4)^2.
= -(x^2 - 8x + 16)
= -x^2 + 8x - 16.
