2a + 3b = 11
4a- 5b = -11

Solve each system of equations using the elimination method.

a=1, b=3

Step-by-step explanation:

2a+3b=11---(1)

4a-5b=-11---(2)

(1)×2-(2): 4a+6b=22

-) 4a-5b=-11

11b=33

b=3

Put b=3 into (1), we have

2a+3(3)=11

2a=2

a=1

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the angle 15 and angle 7 are alternate interior angle with angle 9.

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