A linear equation in two variables represents a straight line on a coordinate plane. The standard form is ax + by + c = 0, where a, b, and c are constants and a and b are not both zero.
Check if (2, 3) is a solution of 2x + 3y − 13 = 0.
Substitute: 2(2) + 3(3) − 13 = 4 + 9 − 13 = 0. Yes, it is a solution.
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