Which of the following is a solution of x2 + 6x = −18?
1 answer:
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(x, y ) = (- 6, 3 )
Since both equations express y in terms of x, we can equate them
2x + 15 = - x + 1
( add x to both sides )
x + 15 = 1 ( subtract 15 from both sides )
x = - 14
( multiply both sides by 3 and divide by 7 )
x = ( 3 × - 14 )/7 = - 6
substitute x = - 6 into either of the 2 equations for y- coordinate )
y = ( 2 × - 6 ) + 15 = 3
solution : (x, y ) = ( - 6, 3 )