Which of the following does NOT describe a rational number? A- Non-repeating decimal B- Perfect square (ex: square root of 4) C-
2 answers:
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Answer:
D. Infinitely many solutions
Step-by-step explanation:
1.Since neither equation contains an isolated. However, we can isolate -y in the first equation by adding to both sides.
Like this:
ending up with
2.Now, we can change y to a positive y. By doing so, we divide -y by the entire equation.
Like this
Ending with
3.Now, we can plug the expression into the second equation as a substitute for y, and solve for x. Then, we can use x to calculate y.
Like this
4. Since -2x+2x would cancel out and leave -30=-30. This is true because we know -30 equals -30 with no variable in sight.