At a concession stand, seven hot dog (s )and two hamburger (s )cost $16.75; two hot dog (s )and seven hamburger (s )cost $19.25.
1 answer:
One hot dog costs $1.75 and one hamburger costs $2.25
Step-by-step explanation:
Let,
Hot dog = x
Hamburger = y
According to given statement;
7x+2y=16.75 Eqn 1
2x+7y=19.25 Eqn 2
Multiplying Eqn 1 by 2;
Multiplying Eqn 2 by 7;
Subtracting Eqn 3 from Eqn 4;
Dividing both sides by 45;
Putting y=2.25 in Eqn 1
Dividing both sides by 7;
One hot dog costs $1.75 and one hamburger costs $2.25
Keywords: linear equations, subtraction
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Answer:
{y | y ≥ -11 }
Step-by-step explanation:
To answer a question like this, it is often helpful to graph the function or to rewrite it to vertex form.
f(x) = 3x^2 +6x -8
f(x) = 3(x^2 +2x) -8 . . . . factor the leading coefficient from x terms
f(x) = 3(x^2 +2x +1) -8 -3(1) . . . . complete the square*
f(x) = 3(x +1)^2 -11
The form of this equation tells you that the graph is a parabola that opens upward. Its vertex is (-1, -11), so the minimum value is -11. The range is the vertical extent of the function values, so goes upward from -11:
y ≥ -11
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* Vertex form is ...
f(x) = a(x -h)^2 +k
where "a" is the vertical scale factor and (h, k) is the vertex. When "a" is positive, the parabola opens upward; when it is negative, the parabola opens downward.
The square is completed by adding the square of half the x-coefficient inside parentheses, and subtracting the equivalent amount outside parentheses. Here, we had 2x inside parentheses, so we added (2/2)^2 = 1 inside and -3(1) outside, because "a" was 3.
_____
Brainly provides tools for properly rendering math symbols. 2-11 is not the same as ≥-11.
