Edit View History Bookmarks Window Help CSTM 0120 TRA Spring 2018 Test: Test #3-

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Edit View History Bookmarks Window Help CSTM 0120 TRA Spring 2018 Test: Test #3-Sections 4.1, 4.2, 4.3 This Question: 1 pt 12of26(1 complete) Solve the system of equations by the substitution method. y=7x+9 y9x+10 Select the corect choice below and, itf necessary, fil in the answer box to complete your choice O A. The solution is (Simplity your answer.Type an ordered pair.) O B. There are infinitely many solutions: Ixy)ly-x+9) or (ixyly-x 10) O C. There is no solution, 0 or a. ock to select ard enter your answers.

Explanation / Answer

y = 7x + 9

y = 9x +10

So, from the above two equation, we can write that,

7x + 9 = 9x + 10

==> 9x - 7x = 9 - 10

==> 2x = -1

==> x = -1/2 = -0.5

So, y = 7x + 9 = 7(-0.5) + 9 = 5.5

So, x = -0.5 and y = 5.5

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