Step by step explanation: I'm Sorry this answer is late but here! I don't really get number 2 I'm sorry.
question 1
x=-y
2x-y=-6
x=-y
2(-y)-y=-6
x=-y
y=2
x=-(2
y=2
(-2,2)
x=-2,
y=2
Question 2
-2x + 6y = 30
-2x + 6y + -6y = 30 + -6y
-2x + 0 = 30 + -6y
-2x = 30 + -6y
x = -15 + 3y
x = -15 + 3y
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Answer:
D. (-3, -2)
Step-by-step explanation:
The equations have different coefficients for x and y, so will have one solution. The solutions offered are easily tested in either equation.
Using (x, y) = (-2, -3):
x = y -1 ⇒ -2 = -3 -1 . . . . False
Using (x, y) = (-3, -2):
x = y -1 ⇒ -3 = -2 -1 . . . .True
2x = 3y ⇒ 2(-3) = 3(-2) . . . . True
The solution is (-3, -2).
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If you'd like to solve the set of equations, substitution for x works nicely.
2(y -1) = 3y
2y -2 = 3y . . eliminate parentheses
-2 = y . . . . . . subtract 2y
x = -2 -1 = -3
The solution is (x, y) = (-3, -2).
The slope of the line is positive
9514 1404 393
Answer:
A, B, D
Step-by-step explanation:
The "opposite" of a number is that number with its sign changed.
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- The opposite of zero is zero.
- A number and its opposite are located the same distance from zero on a number line.
- The opposite of a negative number is always a positive number.