Solve using elimination.–x + 5y = –14x − 10y = –16
Question
Solve using elimination.–x + 5y = –14x − 10y = –16
Solution 1
Sure, let's solve the system of equations using elimination.
The system of equations is:
- -x + 5y = -14
- -x - 10y = -16
Step 1: Align the equations
To use elimination, we need to align the equations so that like terms are vertically aligned. The equations are already aligned.
Step 2: Eliminate one variable
We can eliminate x by adding the two equations together:
(-x + 5y) + (-x - 10y) = -14 + -16
This simplifies to:
-2x - 5y = -30
Step 3: Solve for one variable
Now we can solve for x:
-2x = 5y - 30
x = (5y - 30) / -2
x = -2.5y + 15
Step 4: Substitute x in one of the original equations
We can substitute x in the first equation:
-(-2.5y + 15) + 5y = -14
This simplifies to:
2.5y - 15 + 5y = -14
7.5y - 15 = -14
7.5y = 1
y = 1 / 7.5
y = 0.1333
Step 5: Substitute y in the equation found in step 3
x = -2.5(0.1333) + 15
x = -0.3333 + 15
x = 14.6667
So, the solution to the system of equations is x = 14.6667 and y = 0.1333.
Solution 2
Sure, let's solve the system of equations using elimination.
The system of equations is:
- -x + 5y = -14
- -x - 10y = -16
Step 1: Align the equations
To use elimination, we need to align the equations so that like terms are vertically aligned. The equations are already aligned.
Step 2: Eliminate one variable
We can eliminate x by adding the two equations together:
(-x + 5y) + (-x - 10y) = -14 + -16
This simplifies to:
-2x - 5y = -30
Step 3: Solve for one variable
Now, we can solve for x by dividing every term by -2:
x + 2.5y = 15
Step 4: Substitute back into one of the original equations
We can substitute x = -2.5y + 15 into the first equation:
-(-2.5y + 15) + 5y = -14
This simplifies to:
2.5y - 15 + 5y = -14
7.5y - 15 = -14
7.5y = 1
y = 1 / 7.5
y = 0.1333
Step 5: Substitute y into the equation from step 3 to solve for x
x + 2.5(0.1333) = 15
x + 0.3333 = 15
x = 15 - 0.3333
x = 14.6667
So, the solution to the system of equations is x = 14.6667 and y = 0.1333.
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