WAEC - Mathematics (1993 - No. 13)
Solve the simultaneous equations y = 3x; 4y - 5x =14
.-2,-6
2,6
2,-6
-2,6
-1,-3
Explicació
y = 3x ... (i);
4y - 5x =14 ... (ii)
Put 3x for y in (ii).
4(3x) - 5x = 14
12x - 5x = 14
7x = 14 \(\implies\) x = 2.
y = 3x = 3(2) = 6
(x, y) = (2, 6)