Question 1150315
(1) {{{ y = -x - 6 }}}
(2) {{{ x + 3y = -18 }}}
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(1) {{{ -x - y = 6 }}}
(2) {{{ x + 3y = -18 }}} Add the equations
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{{{ 2y = -12 }}}
{{{ y = -6 }}}
Now plug this result back into either equation
(1) {{{ y = -x - 6 }}}
(1) {{{ -6 = -x - 6 }}}
(1) {{{ x = 0 }}}
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check answers:
(1) {{{ y = -x - 6 }}}
(1) {{{ -6 = -0 - 6 }}}
(1) {{{ -6 = -6 }}}
and
(2) {{{ x + 3y = -18 }}}
(2) {{{ 0 + 3*(-6) = -18 }}}
(2) {{{ 0 + (-18) = -18 }}}
(2) {{{ -18 = -18 }}}
OK