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what is the answer in this equation 2x+y=-5. 2x+3y=9

Sagot :

Equation A:  2x + y = -5 ⇒  y = -2x - 5

Equation B:  2x + 3y = 9
                   2x + 3 (-2x - 5) = 9
                   2x - 6x - 15 = 9
                   -4x = 9 + 15
                   -4x/4 = 24/-4
                    x = -6

Substitute -6 for x in any of the two equations:
2x + y = -5
2 (-6) + y = -5
-12 + y = -5
y = -5 + 12
y = 7

The solution is (-6, 7)

To check:
2(-6) + 7 = -5
-12 + 7 = -5
-5 = -5

2x + 3y = 9
2(-6) + 3 (7) = 9
-12 + 21 = 9
9 = 9


Here Madekuji I solved again
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