Answers:
The value of x is exact. The y value is approximate.
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Explanation:
Let's subtract the equations straight down.
- The x terms subtract to -22x since 9x-31x = 22x
- The y terms go away because 7y-7y = 0
- The terms on the right hand side subtract to 0
After doing those three sets of subtractions, we have the new equation -22x = 0. This solves to x = 0 after dividing both sides by -22.
Plug this x value into any of the two original equations to solve for y
9x + 7y = 48
9(0) + 7y = 48
7y = 48
y = 48/7
y = 6.857 approximately
y = 6.9
