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x = 5 y = 2 4x - 3y = ? 4(5) - 3(2) = ? 20 - 6 = 14
x2 + 4x + 3 = (x + 1)(x + 3)
(A): 4x + y = 7 (B): 2x - 3y = -7 2*(B) 4x - 6y = -14 Subtract from (A) 7y = 21 Divide both sides by 7: y = 3 Substitute in (A): 4x + 3 = 7 ie 4x = 4 or x = 1 Answer: x = 1 , y = 3
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The equation 4x + 5 = 2 has the solution 4x = -3 and x = - 3/4 (minus 3/4).