82/4+20-15
82:4=20.5
20.5+20=40.5
40.5-15=25.5
Solve the equation by substitution method.
To get b-2-3b=4. Then you substitute b into simplest to get, b=-3. Repeat the same process with a to get, a=-5. So your answer would be (-5, -3)
3x-7>2
add 7 to both sides: 3x>9
divide both sides by 3: x>9
7 goes into 6,300 900 times so your answer is 6,300
