2a + 3b = 2 * 5 + 3 * 10 = 10 + 30 = 40;
2a + 3b = 2 * 6 + 3 * 5 = 12 + 15 = 27;
2a + 3b = 2 * 7 + 3 * 2 = 14 + 6 = 20;
2a + 3b = 2 * 8 + 3 * 1 = 16 + 3 = 19;
2a + 3b = 2 * 9 + 3 * 0 = 18;
4a − 2b = 4 * 5 − 2 * 10 = 20 − 20 = 0;
4a − 2b = 4 * 6 − 2 * 5 = 24 − 10 = 14;
4a − 2b = 4 * 7 − 2 * 2 = 28 − 4 = 24;
4a − 2b = 4 * 8 − 2 * 1 = 32 − 2 = 30;
4a − 2b = 4 * 9 − 2 * 0 = 36.