Systems of equations 5x+y=7
20x+2=y
1 answer:
Step-by-step explanation:
5x+y=7
20x+2=y
put y value in first equation
5x+(20x+2)=7
25x=5
x=5
now put x value to determine y
as we know 20x+2=y
20(5)+2=y
y=102
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4x + 16= -2
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4x= -18
x= -4.5
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second one is 10
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