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3 years ago

What is the justification for the step taken from line 2 to line 3?

Mathematics

2 answers:

stiv31 [10]3 years ago

3 0

Step-by-step explanation:

$3x+9-7x=x+10+x\\-4x+9=2x+10\\-6x+9=10\\$

In the line 2, only variables were operated with a reduction of similar terms in each side of the equation, giving as result -4x at one side, and 2x at the other side.
In the line 3, terms with variables were joined together in one side of the equation, and then, they were operate it, given as result -6X.

brilliants [131]3 years ago

3 0

Answer:

the subtraction property of equality

Step-by-step explanation:

up up up uppity

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Answer:

28. m<A=20°, m<B=70°

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Step-by-step explanation:

complementary angle=a+b=90°

supplementary angle=a+b=180°

28. A+B=90°

5x+17x+2=90°

22x+2=90°

22x=90-2

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Check

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