Bivariate linear equation: 2 parts x + 3 parts y = 7 ①, 3 parts 2X-4 parts y = 1 ② RT, with addition, subtraction and elimination

From (1)
3x+2y=42 (3)
From (2)
8x-3y=12 (4)
(3) (4) × 2
25x=150
x=6
Substituting x = 6 into (3) yields
18+2y=42
y=-12
∴x=6
y=-12

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