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pinkyglitter2696
27.01.2021 •
Mathematics
10x + 4y = 24 6x +12y = 48 What is the value of y? *
A. 7
B. 7/2
C. 1
D. -7/2
Solved
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Ответ:
B
Step-by-step explanation:
1) lets use elimination to solve this:
multiply 10x+4y=24 with 3 in order to get "4y" into "12y"
3(10x+4y=24)
30x+12y=72
now subtract both equations to eliminate 'y"
30x+12y=72
-
6x+12y=48
24x=24
x=1
now substitute 1 in the above equation:
6(1)+12y=48
6+12y=48
12y=42
y=7/2
Ответ:
9 is the correct answer. definitly B