Question

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Answer 1

you have 4 choice to do this problem
elimination
substitution
graphing
matrices
which one you want??

Answer 2

ok once you already have a variable with same coefficient with same sign which is +
so multiply one of equation with -1 to get opposite sign

Answer 3

let me know the what you get so we can continue

Answer 4

syeah right son now you have
now you can eliminate