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x + y = 4 and y = 2x + 1
The first equation can be rearranged to show x = 4 - y (Effectively y has been subtracted from both sides)
Now substitute for 'x' in the equation y = 2x +1
y = 2(4 - y) + 1 = 8 - 2y + 1 = 9 - 2y
y = 9 - 2y can be rearranged to show 3y = 9 (Effectively adding 2y to both sides)
and by dividing by 3 then y = 3.
Now substitute the value for y in x + y = 4
x + 3 = 4 ; x = 1
Answer : x = 1, y = 3
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