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2. 3x - y = 5 /×(-2)
5x - 2y = 7
X=3
Y=4
3. x-3y=5 /×(-3)
y+3x=-5
y = -2
x = -1
4. 2x-3y=7 /× (-3)
3x-5y=11/×2
y = -1
x = 2
5. 5p-2r=211/×(-3)
3p+5r=-6/×5
31r = -663 ??? r = -21.387...
6.
2x-3y=10 /×(-5)
5x+5y=0 /×2