3 years ago

How do you do it ???

1 answer:

8 0

4x+y=25
x-3y=16

substitute the value of y into the equation by moving 4x (from the first equation) to the right side
y=25-4x

substitute the given value of y into the equation x-3y=16

x-3(25-4x)=16
x-75+12x=16 (add 75 to both sides of the equation)
13x=91 (divide by 13 both sides of the equation)
x=7

y=25-4x=25-(4×7)=25-28=-3

answer: x=7, y=-3

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there are a 100 student in a garde 79 students has honors what deciaml best represents the amount that the student honors

gogolik [260]

There are 100 students. In the 100 students, 79 of them have honors. To find the decimal form for the students who have honors, divide the total amount of students with honors with the total amount of students.

$\frac{Honors}{Total} = \frac{79}{100}$