algebra problems please solve and show how to solve

Solve each by elimination 1. 2x-15y=21 10x+5y=25 2.10x+12y=-8 -x-4y=12 3. 5x-9y=-9 -15x-6y=-6 4. X+14y=24 -7x-7y=14 5. -9x+y=0 2x+11y=0
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line 1: 2x-15y=21... line 2: 10x +5y=25, or 30x +15y=75... line1+line2: 32x=21+75=96... x=96/32... x=3... line 1: 15y=2x-21=6-21=-15... y=-1
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