Question 325027
1.{{{x+9y=52}}}
2.{{{-x+6y=23}}}
Add eq. 1 and eq. 2 to eliminate x,
{{{15y=75}}}
{{{highlight(y=5)}}}
Then use either equation to solve for x,
{{{x+45=52}}}
{{{highlight(x=7)}}}
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{{{0.3x-0.2y=4}}}
1.{{{3x-2y=40}}}
{{{0.4x+0.3y=-1}}}
2.{{{4x+3y=-10}}}
Multiply eq. 1 by 3 and eq. 2 by 2 and add them,
{{{9x-6y+8x+6y=120-20}}}
{{{17x=100}}}
{{{highlight(x=100/17)}}}
Then use either equation to solve for y.
{{{300/17-2y=40}}}
{{{-2y=680/17-300/17}}}
{{{-2y=380/17}}}
{{{highlight(y=-190/17)}}}