When you distribute you get 12x-24-7x=-80
when you combine like terms you get 5x=-56
answer : x = -11.2
Answer:
dont we all
Step-by-step explanation:
Y -3x = 7 from this result y = 7 +3x what value of y we need substituting in place of y inside second equation and will get
21 +9x = 3y
21 +9x = 3(7 +3x)
21 +9x = 21 +9x
0 = 0
so this mean that there are an infinite number solutions so choice B. is right
Answer:
Step-by-step explanation:
To use substitution in this problem, you find the Y which ='s -3. That we have clear. Now, the second equation becomes x - 5(-3) =7. A negative times a negative is a positive, so 15. Now, we have x + 15 = 7. Subtract 15 from 7 to get x = -8. Your coordinates, or your answer, will be (-8, -3)
Answer:
1.5 inches
Step-by-step explanation:
(10+2x)(14+2x) = 221
4x² + 48x - 81 = 0
4x² + 54x - 6x - 81 = 0
2x(2x + 27) - 3(2x + 27) = 0
(2x + 27)(2x - 3) = 0
x = -27/2, 3/2
x = 3/2 or 1½ or 1.5 inches