Answer:
1. 7x+5y=19
(+)-7x-2y=-16 step one
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=
step two
y=1
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since you have the value of y u can plug it in in either of the equations.
7x+5(1)=19 step three
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7x+5-5=19-5 step four
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=
x=2 step five
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You can check whether the answers are correct by plugging them back in.
7(2)+5(1)=19
14+5=19
19 equals 19 so it checks.
You can do the same thing for the rest.