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bobby3350
19.10.2020 •
Mathematics
Which system of equations is equivalent to the following system?
4x + y = 4
2x + 7y = 28
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Ответ:
the third one
-28x-7y=-28
2x+7y=28
Step-by-step explanation:
for the first one, the 2x+7y=28 is being multiplied by -1, but its not being distributed correctly (28 is incorrect, it should be -28)
for the second one, the 2x+7y=28 is being multiplied by -4, but again, is not being distributed correctly (112 is incorrect, it should be -112)
for the fourth one, 4x+y=4 is being multiplied by -2, but its not being distributed correctly (8 is incorrect, it should be -8)
Ответ:
See explanation
Step-by-step explanation:
Assuming the point A has coordinates (2,3) and the center of dilation is the origin.
Then the image of point A under a dilation of scale factor of 4 is![(4*2,4*3)=(8,12)](/tpl/images/0461/3569/23166.png)
Hence![A(2,3)\to A'(8,12)](/tpl/images/0461/3569/b0f24.png)
In general the rule for a dilation of scale factor of k is![(x,y)\to(kx,ky)](/tpl/images/0461/3569/d293d.png)