Question 312522
If you want to eliminate {{{ x }}} , you have to multiply {{{ 5x}}} and {{{ 7x}}}, so multiply {{{ 5x}}} by {{{ 7}}} and {{{ 7x}}} by {{{ -5}}} so when they add you will have {{{ 35x-35x=0}}}.
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If you want to eliminate {{{ y}}}, you have to multiply {{{ 2y}}} and {{{ -3y}}}, so multiply {{{ 2y}}} by {{{ 3}}} and {{{ -3y}}} by {{{ 2}}} so when they add, you'll get {{{ 6y-6y=0}}}.