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Mathematics

2 answers:

KengaRu [80]3 years ago

7 0

Answer:

x=9

Step-by-step explanation:

4x+6+7x+15=120 combine like terms it becomes 11x+21 =120 take away 21 from 120 , leaves you with 11x=99 divide by 11 to get x alone leaves you with x=9 :)

muminat3 years ago

7 0

Answer:

ab = 42

Step-by-step explanation:

4x + 6 + 7x + 15 = 120

combine like terms

11x + 21 = 120

subract 21 from both sides

11 x = 99

x = 9

plug in to double check 9 in 4x + 6 + 7x + 15

meaning 4 times 9 + 6 + 7 times 9 + 15

36 + 6 + 7 times 9 + 15

Then simplify,

42 + 7 times 9 + 15

Then simplify again,

42 + 63 + 15

Then simplify one last time,

42 + 78

and your answer is

120

meaning the X is right so now plug in the X in 4x +6

and your answer is 42

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