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TASK #9
At McDonald's four cheeseburgers
and three medium fries have a
total of 2290 calories. Six
Cheeseburgers and twomedium
fries have 2560 calories.
How many calories doeseach item
contain?

Respuesta :

X= cheeseburgers
Y= mediun fries

4x+3y=2290
6x+2y=2560

We want to solve fries first so we multiply the top with 2 and the bottom with -3

8x+6y=4580
-18x-6y=-7680

Now we reduce
-10x=-3100

Now we must divide by -10

X= 310


Cheeseburgers are 310calories

Now just input that in one of the equations

4x+3y=2290

4*310+ 3y=2290
1240+ 3y= 2290

Change the place of 1240
3y=2290-1240
3y=1050

Now divide by 3

Y=350
Fries have 350calories

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