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Deffense [45]
3 years ago
14

Find the value of a and b​

Mathematics
1 answer:
choli [55]3 years ago
5 0

Step-by-step explanation:

2b=180-40

2b=140

b=70

a=180-90-70=20°

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7 0
3 years ago
9x−9y=0 3x−4y=10 solve by elimination
NikAS [45]

Answer:

(-10,-10)

Step-by-step explanation:

9x-9y=0

3x-4y=10

In elimination, we want both equations to have the same form and like terms to be lined up.  We have that.  We also need one of the columns with variables to contain opposites or same terms. Neither one of our columns with the variables contain this.  

We can do a multiplication to the second equation so that the first terms of each are either opposites or sames. It doesn't matter which.  I like opposites because you just add the equations together. So I'm going to multiply the second equation by -3.

I will rewrite the system with that manipulation:

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-9x+12y=-30

----------------------Add them up!

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     3y=-30

       y=-10

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I'm going to use 9x-9y=0 where y=-10.

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9x-9y=0 where y=-10.

9x-9(-10)=0  where I plugged in -10 for y.

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9x     =-90 where I subtracted 90 on both sides.

x=       -10 where I divided both sides by 9.

The solution is (x,y)=(-10,-10)

3 0
3 years ago
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