Answer:
3) x = 1.8, y = -7.2 4) x = -2, y = 1
Step-by-step explanation:
Question 3:
The two equations are both equal to y in question 3, meaning we can set them equal to each other:
- x - 9 = -4x
- -9 = -5x
- x = 1.8
Find y by plugging x into either equation:
- y = -4x
- y = -4(1.8)
- y = -7.2
Question 4:
Use substitution for question 4 by plugging the second equation into the first's y:
- x + 3(2x + 5) = 1
- x + 6x + 15 = 1
- 7x = -14
- x = -2
Find y by plugging x into either equation:
- y = 2(-2) + 5
- y = -4 + 5
- y = 1
