Question

02)a pair of equations is shown below. 3x − y = 9 y = −2x + 11 if the two equations are graphed, at what point do the lines representing the two equations intersect? (4, 3) (3, 4) (9, 11) (11, 9)

Answer 1

 3x - y = 9
-2x -y = -11   |* -1

3x - y = 9    } +
2x+y = 11
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5x    / =20
x=20:5
x=4

3x   -y = 9
3*4 - y = 9
12 - y= 9
y=12-9
y=3

(4,3) is the solution