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2 answers:
Answer:
D
Step-by-step explanation:
Given the 2 equations
y = 2x + 3 → (1)
y = - x - 2 → (2)
Since both equations express y in terms of x, equate the right sides
2x + 3 = - x- 2
Multiply through by 2 to clear the fraction
4x + 6 = - x - 4 ( add x to both sides )
5x + 6 = - 4 ( subtract 6 from both sides )
5x = - 10 ( divide both sides by 5 )
x = - 2
Substitute x = - 2 into (1) for corresponding value of y
y = 2(- 2) + 3 = - 4 + 3 = - 1
Solution is (- 2, - 1 ) → D
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When thinking of what determines a plane we can make the following comparison.
If a plane was the top part of a table, 3 legs, whose tops are points W, X and Y may hold it, as shown in the first picture.
but if the legs are in a line, as in the second figure, they may not hold the top part, so 3 collinear points cannot determine a plane.
When thinking of what determines a plane we can make the following comparison.
If a plane was the top part of a table, 3 legs, whose tops are points W, X and Y may hold it, as shown in the first picture.
but if the legs are in a line, as in the second figure, they may not hold the top part, so 3 collinear points cannot determine a plane.