The general form of linear equation is
ax + by + c = 0
Write 2x + 3y = 20 in general form
2x + 3y = 20
2x + 3y − 20 = 0
Comparing with ax + by + c = 0
a = 2, b = 3, c = −20
Write x = −5 as an equation in two variable
Write 2x = y as an equation in two variable
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