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4x-y = 21 ----------------> 12x-3y = 63 -
13y = -13
y = -1
4x-y = 21
4x-(-1) = 21
4x+1 = 21
4x = 21-1
4x = 20
x = 20/4
x = 5
x+3y = 5+3.(-1)
= 5-3
= 2
4x - y = 21 | 3 | ⇒ 12x - 3y = 63
13y = -13
y = -13/13
y = -1
4x - y = 21
4x - (-1) = 21
4x = 21 - 1
x = 20/4
x = 5
x + 3y = 5 + 3(-1)
= 5 + (-3)
= 2