Question 320375
0.3x-0.2y=4
0.2x+0.54y=-3
Multiply both equation by 100
1.{{{30x-20y=400}}}
2.{{{20x+54y=-300}}}
Multiply eq. 1 by 2 and eq. 2 by -3 and add them to eliminate x.
{{{60x-40y-60x-162y=800+900}}}
{{{-202y=1700}}}
{{{highlight(y=-850/101)}}}
Then from eq. 1,
{{{30x-20(-850/101)=400}}}
{{{30x+17000/101=40400/101}}}
{{{30x=23400/101}}}
{{{highlight(x=780/101)}}}