Question 374556
y=-7/5x+1
multiply both sides by 5
5y=-7x+5
add 7x to both sides
7x+5y=5
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y+4=-7(x-1)
multiply
y+4=-7x+7
add 7x to both sides
7x+y+4=7
subtract 4 from both sides
7x+y=3
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-10x-y=-5
multiply through by -1
10x+y=5
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You try the last one.
Bob