Solution for system (e):
Method: We will rearrange the second equation to isolate a variable and then use substitution to solve the system.
Step-by-step solution:
- Step 1: Rearrange the second equation.
The second equation is 5z = -4y - 11.
Let's rearrange it to solve for z: z = (-4y - 11) / 5. - Step 2: Substitute the expression for 'z' into the first equation.
The first equation is 9y + 8z = -2.
Substitute z: 9y + 8 * ((-4y - 11) / 5) = -2. - Step 3: Solve for 'y'.
Multiply the entire equation by 5 to eliminate the fraction:
5 * (9y) + 5 * (8 * ((-4y - 11) / 5)) = 5 * (-2)
45y + 8 * (-4y - 11) = -10
45y - 32y - 88 = -10
13y - 88 = -10
13y = -10 + 88
13y = 78
y = 78 / 13
y = 6 - Step 4: Substitute the value of 'y' back into the rearranged second equation to solve for 'z'.
z = (-4y - 11) / 5
z = (-4 * 6 - 11) / 5
z = (-24 - 11) / 5
z = -35 / 5
z = -7
Answer: y = 6, z = -7