The CEFR Levels - Common European Framework of Reference for Languages (CEFR)
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If a1/a2 = b1/b2≠c1/c2 , then equations a1x + b1 + c1 = 0 and a2x + b2y + c2 = 0 are
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Correlation matrix (A1) (A2) (A3) (B1) (B2) (B3) (B4) (C1) (C2) (D1) | Download Table
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Ex 3.2, 2 (i) - Check if pair of linear equations intersect, parallel
CEFR Levels Explained - Now I Know - EU English » EU English
IFDelta1=|{:(a1^2+b1+c1,a1a2+b2+c2,a1a3+b3+c3),(b1b2+c1,b2^2+c2,b2b3+c1 ),(c3c1,c3c2,c3^2):}|,Delta2|{:(a1,b1,c1),(a2,b2,c2),(a3,b3,c3):}| then find the value of (Delta1)/(Delta2)
