Answer:
x = -2, y = 7
Step-by-step explanation:
Since it's a system of equations, we know that the they use the same variables. To use substitution to solve a system of equation, we must take one equation and solve it for a variable, then you plug the solution into that variable for the other equation:
-2x + y = 11
y = 2x + 11
-------
4x + 4y = 20
4x + 4(2x + 11) = 20
4x + 8x + 44 = 20
12x + 44 = 20
12x = -24
x = -2
Then we can plug "x" into the first equation:
-2x + y = 11
-2(-2) + y = 11
4 + y = 11
y = 7
Just imagine having 6 one blocks. Then you have 7 groups of those 6 one blocks. Then that's it!
When an equation expresses y, it is basically saying something like this: "y = _____". When an equation expresses y in terms of x, the blank space is filled with numbers based on x. For example, expressing y in terms of x could be "y = 2x". This would mean that y is equal to whatever x is times 2.
- Cost of soft drink =4$
- Total spent=40$
Cost of 9candies=40-4=36$
Cost of one candy:-
![\\ \sf\longmapsto \dfrac{36}{9}](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5Clongmapsto%20%5Cdfrac%7B36%7D%7B9%7D)
![\\ \sf\longmapsto 4\$](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5Clongmapsto%204%5C%24)