tylercarey5
22.07.2020 •
Mathematics
If 3x + 9y = 21 , find the value of 4(x + 3y)
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Ответ:
25
Step-by-step explanation:
The method that should be used is substitution:
Do this by taking 3x+9y=21 and transforming it to be
Once you have this, substitute the value of y that we just found into 3x+9y=21 to find the value of x:
Solve for x. You should get 1.5
Once you have this, Plug in 1.5 for the value of x into the y= equation that we found in the beginning:
Solve for y. You should get 1.583 (19/12)
Plug in the values of x and y that we found into the last equation to find its value: 4(1.5+3(1.583))
Ответ: