2x - y = 9
3x + 4y = -14
To solve this system using elimination, one of the pairs of variable terms must cancel each other out. Their coefficients must be opposites of each other.
Multiply the top equation by 4.
2x - y = 9
4(2x - y = 9)
8x - 4y = 36
Add the equations together.
8x - 4y = 36
3x + 4y = -14
+___________
11x - 0 = 22
11x = 22
x = 2
Substitute 2 for x into either of the original equations to find y.
2x - y = 9
2(2) - y = 9
4 - y = 9
-y = 5
y = -5
Finally, check work by plugging x- and y-values into each original equation.
2(2) - (-5) = 9 --> 4 + 5 = 9 --> 9 = 9 --> True
3(2) + 4(-5) = -14 --> 6 - 20 = -14 --> -14 = -14 --> True
Answer:
x = 2 and y = -5; (2, -5).
Answer:
it’s d on edg
Step-by-step explanation:
Answer: C. 10 + 2h = 30
Step-by-step explanation:
- A does not make sense because the phone billing company would not be cutting off the money they earn while Jeremiah is on a call with someone.
- B does not make sense because the phone billing company would be charging Jeremiah a higher amount than the amount he uses while speaking on the phone.
- C makes sense because the phone billing company charges Jeremiah the total amount of his phone and $2 per hour he is on a phone call with someone.
- D does not make sense because the total is 30 not h.
Answer:in what can I help
Step-by-step explanation:
