Question 212996
Solve:
{{{x+8y = -7}}} Rewrite this as: {{{x = -8y-7}}} and substitute into the second equation.
{{{8x+9y = 7}}}
{{{8(-8y-7)+9y = 7}}} Simplify the left side.
{{{-64y-56+9y = 7}}}
{{{-55y-56 = 7}}} Add 56 to both sides.
{{{-55y = 63}}} Divide both sides by -55.
{{{y = -63/55}}} Now substitute this into the first equation and solve for x.
{{{x+8(-63/55) = -7}}}
{{{x-(504/55) = -7}}}
{{{x = 119/55}}}
{{{x = 2.164}}}
{{{y = -1.145}}}
{{{graph(400,400,-5,5,-5,5,-(1/8)x-7/8,-(8/9)x+7/9)}}}