[b][size=200]Practice![/size][br]Solve the following systems of linear equations by elimination (without graphing):[/b]
[size=200][color=#ff7700][b]System 1[/b][/color][/size]
[math]\begin{cases} 5x + 4y = 8 \\ 10x - 4y = 46 \end{cases}[/math][br]
[size=200][color=#ff7700][b][b]System[/b] 2[/b][/color][/size]
[math]\begin{cases} 5x + 4y = 24 \\ 2x - 7y =26 \\ \end{cases}[/math][br]
[size=200][color=#ff7700][b][b]System[/b] 3[/b][/color][/size]
[math]\begin{cases} 7x-12y=180 \\ 7x=84 \\ \end{cases}[/math]
[size=200][color=#ff7700][b][b]System[/b] 4[/b][/color][/size]
[math]\begin{cases}\text-16y=4x\\ 4x+27y=11\\ \end{cases}[/math]