Answer:
x = 15
Step-by-step explanation:
The two angles form a straight line so they add to 180 degrees
3+6x + 5x+12 = 180
Combine like terms
11x+15 = 180
Subtract 15 from each side
11x+15-15 =180-15
11x = 165
Divide by 11
11x/11 =165/11
x =15
1.25x2=2.50
2.50x2=5.00
Total-7.50
20.00-7.50=12.50
Answer:
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I am better at substitution, but you want to get the equations as similar as possible, but are the opposite, so you can cancel it out.
Answer:
Step-by-step explanation:
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