What is the value of y when x = 6? -3x + 9y = 18
2 answers:
Answer:
y=4
Step-by-step explanation:
We are given the expression:
We want to find when
equals 6. Therefore, we can plug 6 in for x.
Now, let's begin solving for y. First, multiply -3 and 6.
Next, add 18 to both sides of the equation. We add because 18 is negative and addition will cancel out the -18 on the left.
Finally, divide both sides by 9. We divide because y is being multiplied by 9, and division is the inverse of multiplication.
When x=6 in the equation, y is equal to 4.
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Answer:
C. x+y = 1 and -x-y = -1
Step-by-step explanation:
Remember that if a system of equations has an infinite number of solutions, then the resulting equation from using the first step of the elimination method would have no variables and would be true.
1) Let's try canceling out the equations in option C, x+y =-1 and -x-y =-1. Add the two equations together. (Work shown in attached picture.)
2) All of the terms cancel out with each other, leaving only a true statement of 0 = 0. Thus, option C is the answer.
