LESSON 17-1 PRACTICE In Items 14 and 15, the measures of two angles of a triangle are given.
Find the measure of the third angle of the triangle.
14. 23°, 78°
15. 105°, 40°

The answer will be y=-5+0 because the slope is -5 and the it has to go through y-axis 0

8-2x+3x2=6 and six is your answer

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

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