6x + y = 7
y = 7 − 6x
при x = −1, y = 7 − 6 * (−1) = 7 + 6 = 13, (−1;−13);
при x = 4, y = 7 − 6 * 4 = 7 − 24 = −17, (4;−17);
при x = −2, y = 7 − 6 * (−2) = 7 + 12 = 19, (−2;19).

2x − 3y = −4
2x = 3y − 4
x = 1,5y − 2
при y = −10, x = 1,5 * (−10) − 2 = −15 − 2 = −17, (−17;−10);
при y = 2, x = 1,5 * 2 − 2 = 3 − 2 = 1, (1;2);
при y = 1, x = 1,5 * 1 − 2 = 1,5 − 2 = 0,5, (0,5;1).