4. Solve the following system of equations.
50π₯+20π¦=1800 10π₯+3π¦=300
"\\begin{cases}\n 50x+20y=1800, \\\\\n 10x+3y=300;\n\\end{cases} \\implies"
"\\begin{cases}\n 50x+20y=1800, \\\\\n 50x+15y=1500;\n\\end{cases} \\implies"
"\\begin{cases}\n 50x+20y=1800, \\\\\n 5y=300;\n\\end{cases}\\implies"
"\\begin{cases}\n 50x+20y=1800, \\\\\n y=60;\n\\end{cases}\\implies"
"\\begin{cases}\n 50x+1200=1800, \\\\\n y=60;\n\\end{cases} \\implies"
"\\begin{cases}\n x=12, \\\\\n y=60.\n\\end{cases}"
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