What is the first step in solving this system of equations by elimination? 5a + 3b = –9 2a – 5b = –16 a. subtract the two equations. b. add the two equations. c. solve for a. d. multiply the first equation by 2 and the second by –5.

Multiply the first equation by 2 and the second by

Step-by-step explanation:

To solve for a  and b we use elimination method

To eliminate variable 'a', we need to make the coefficient same but with different sign

So we multiply the first equation by 2 and second equation by

When we add both equations, the variable 'a' will get eliminated

Multiply the first equation by 2 and the second by

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.