3 years ago

What is the algebraic rule for reflection

2 answers:

7 0

When you reflect a point across the y-axis, the y coordinate remains the same, but the x-coordinates is transformed into its oppisite

BabaBlast [244]3 years ago

4 0

Answer:

reflection across line y=x:

(x,y)---->(y,x)

reflection across line y=-x:

(x,y)---->(-y,-x)

reflection across x-axis:

(x,y)---->(x,-y)

reflection across y-axis:

(x,y)---->(-x,y)

Step-by-step explanation:

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at a country concert,the ratio of number of the Boys to the number of girls is 2:7 if there are 250 more girls than boys how man

sergey [27]

Answer:

100

Step-by-step explanation:

Ratio is a fraction, so ratio of boys to girls would be written as [let boys be "b" and girls be "g"]:

$\frac{b}{g}=\frac{2}{7}$

Also, there are 250 more girls than boys, so we can write:

g = 250 + b

Lets substitute this into "g" of the ratio we wrote and cross mulitply and solve for b:

$\frac{b}{g}=\frac{2}{7}\\\frac{b}{250+b}=\frac{2}{7}\\7b=2(250+b)\\7b=500+2b\\5b=500\\b=\frac{500}{5}=100$

The number of boys = 100

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