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3x2 = 21 describes two single values, and does not have an x intercept. 3x2 = 21 ∴ x2 = 7 ∴ x = ±√7
3x - 7 = 2 3x = 9 x = 3
if 3x+7 = 3 then 3x = 3-7 3x = -4 then, x = -4/3
If: 3x+2y = 5x+2y = 7 Then: 3x+2y = 7 and 5x+2y = 7 Subtract the 1st equation from the 2nd equation: 2x = 0 or x = o By substitution: x = 0 and y = 3.5
Linear. The only power for the variables is 1.