1.
{a=b
{2a+b=9
{2b+b=9
{3b=9
{b=3
{a=3
a)
a=b
2a+b=9
a-b=0
------------+
3a=9
a=3
b)
2x-y=10
x+5y=17
10x-5y=50
---------------+
11x=67
x=⁶⁷/₁₁
x=6¹/₁₁
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1.
{a=b
{2a+b=9
{a=b
{2b+b=9
{a=b
{3b=9
{b=3
{a=3
a)
a=b
2a+b=9
a-b=0
2a+b=9
------------+
3a=9
a=3
b)
2x-y=10
x+5y=17
10x-5y=50
x+5y=17
---------------+
11x=67
x=⁶⁷/₁₁
x=6¹/₁₁