{a2 + a4 = 12
{a1 + a6 = 14
{a1+r + a1+3r = 12
{a1 + a1+5r = 14
{2a1 + 4r = 12 |•(-1)
{2a1 + 5r = 14
{-2a1 - 4r = -12
+__________
r = 2
{2a1 + 5r = 14
{r = 2
{2a1 + 5•2 = 14
{2a1 + 10 = 14
{2a1 = 14 - 10
{2a1 = 4 |:2
{a1 = 2
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{a2 + a4 = 12
{a1 + a6 = 14
{a1+r + a1+3r = 12
{a1 + a1+5r = 14
{2a1 + 4r = 12 |•(-1)
{2a1 + 5r = 14
{-2a1 - 4r = -12
{2a1 + 5r = 14
+__________
r = 2
{2a1 + 5r = 14
{r = 2
{r = 2
{2a1 + 5•2 = 14
{r = 2
{2a1 + 10 = 14
{r = 2
{2a1 = 14 - 10
{r = 2
{2a1 = 4 |:2
{r = 2
{a1 = 2