if x = 30 and y = 20 what is the value of 7y + 9x?
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Correct option is
C
4
7x+9y=4(1)
9x+7y=22 (2)
Add equations (1) and (2),
7x+9y+9x+7y=42+22
16x+16y=64
16(x+y)=64
x+y=4
Step-by-step explanation:
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