Asked by lijm
A ball and a bat cost $110 total. The bat costs $100 more than the ball. How much does the ball cost?
For this system of equation,
I designated x for the ball and y for the bat. I know that both equal to 110.
So I wrote the first equation as
x+y=110
I don't know how to proceed for the second equation.
For this system of equation,
I designated x for the ball and y for the bat. I know that both equal to 110.
So I wrote the first equation as
x+y=110
I don't know how to proceed for the second equation.
Answers
Answered by
lijm
Since the ball is less than the bat, would it be subtracted?
Answered by
Reiny
Do it with one variable:
cost of ball ---- x
cost of bat = x + 100
x + x + 100 = 110
2x = 10
x = 5
ball costs $5, bat costs $105
your way:
x+y = 110
y - x = 100
Add them: 2y = 210
y = 105
sub back into the first and do it mentally, x = 5
cost of ball ---- x
cost of bat = x + 100
x + x + 100 = 110
2x = 10
x = 5
ball costs $5, bat costs $105
your way:
x+y = 110
y - x = 100
Add them: 2y = 210
y = 105
sub back into the first and do it mentally, x = 5
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