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Carissa
Mathematics
7 April, 09:29
6.4x + 3y=36 when x=3
A. 5
B. 9
C. 6
D. 8
+2
Answers (
2
)
Carina Cameron
7 April, 09:41
0
Step-by-step explanation: First we substitute x as 3
then, the equation will be 4*3+3*y=36 (we should no that there is a hidden multiplication sign between 4 and x (3) and 3 and y)
also between 4x and 3y there is a hidden multiplication sign
then we can simplify the equations as 12+3y=36
if we want to make the unknown number that is 3y independent we must remove 12. How do we do it? we know that + and - gives neutral so
12-12+3y=36-12 (now we have put 12 to the other side making the unknown value independent. Also infront of 12 there is an invisible + sign)
now we can simplify it further + 12-12=0
3y=36-12
3y=24
now to find y we have to remove 3 from it. we know its 3*y, right
so if we do the opposite sign 3 will get removed
then 3y : 3=24:3 (why i divided 24 also by 3 is, if i add a mathematical equation to one term of the equation i have to do it for others too)
then the equations will be y=8
and the answer is D
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Maddox Bush
7 April, 09:59
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y = 5.6
Step-by-step explanation:
6.4x + 3y=36 when x=3
Substituting for x:
6.4*3 + 3y = 36
19.2 + 3y = 36
3y = 36 - 19.2
3y = 16.8
y = 5.6.
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