Multiply each equation by a constant that would help to eliminate the y terms.

2 x minus 5 y = negative 21. 3 x minus 3 y = negative 18.

What are the resulting equations?

6 x minus 15 y = negative 63. Negative 15 x + 15 y = 90.

6 x minus 15 y = 63. Negative 15 x + 15 y = 90.

6 x minus 15 y = negative 63. Negative 15 x + 15 y = negative 90.

6 x minus 15 y = negative 63. Negative 15 x + 15 y = 90.

Therefore the required resulting equation is

6 x minus 15 y = negative 63.

Negative 15 x + 15 y = 90

Step-by-step explanation:

Given:

        ......................Equation ( 1 )

        ......................Equation ( 2 )

To Find:

Expression after multiplying to eliminate y term,

Solution:

So to eliminate 'y' term we need to multiply equation 1 by a constant 3 and equation 2 by a constant -5,  such that equations  becomes

.....( 1 )

 .....( 2 )

so now by adding new equation one and two we can eliminate y term that means -15y and +15y will get cancel,

Therefore the required resulting equation is

6 x minus 15 y = negative 63.

Negative 15 x + 15 y = 90

.

step-by-step explanation:

.

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.