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Adding two equations is an easy step. First choose a variable you want to eliminate. Multiply each one by the number that would get you the opposite or additive inverse so it will be gone from the modified equation.
x+y=5 =>3x+3x=15
2x-3x=-5 =>2x-3x =-5
5x =10
x = 2
Substitute that number into one of the equations and solve for the other.
2+y=5
y=3
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How do you know if you will subtract or add in simplifying algebraic expressions?
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You add the numerators and put over the denominator.
How do you add similar rational algebraic expressions?
Lcd/lcm
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How do you evaluate expressions with fractions?
Add, subtranct, multiply, divide, do whatever the expression calls for.
After you add or subtract two rational expressions it's a good idea to see if you can your answer?
reduce
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Two angles that add to 180 degrees?
When two angles add up to 180 degrees, they are supplementary to each other.
What do waves do when there in phase?
Waves in phase add to each other and become stronger.
What is it called when waves combine with each other?
When waves combine with each other, it is called interference. Interference can be constructive, where the amplitudes of the waves add up, or destructive, where the amplitudes cancel each other out.
