Chứng minh mệnh đề sau bằng phương pháp phản chứng:
1 answer:
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Answer:
The y-coordinate would be 17.5
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or
In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
Let
y ----->material needed in yards
x ----> number of curtains
we know that
For y=5, x=2
Find the value of the constant of proportionality k
substitute the given values of x and y
The linear equation is equal to
If the x-coordinate was 7
then
substitute in the equation x=7 and solve for y
therefore
The y-coordinate would be 17.5