Answer:
x = 6; y = 3
Explanation:
I would believe this is simultaneous equation
4x + y = 27 is equation 1
3x - y = 15 is equation 2
I’ll use substitution
Substitution :
In equation 1 let’s make either 4x or y the subject of the formula
I’ll use y
y = 27 - 4x let’s make it equation 3
4x because -4x because it went to the other side
Then we input the equation 3 into equation 2
So we replace y with equation 3
In equation 2 the coefficient of -y is 1 because we only have
one unit of y
3x - 1 (27 - 4x) = 15
Note : + x + = +
+ x - = -
- x - = +
- x + = -
That would make it be
3x - 27 + 4x = 15
We take like terms and move -27 to the other side
3x + 4x = 15 + 27
7x = 42
Divide both sides by the coefficient of x which is 7
x = 42/7
x = 6
To get why we input the answer for x in equation 3
y = 27 - 4(6)
y = 27 - 24
y = 3
To confirm we input the values in any of the equation
4(6) + 1(3)= 27
24 + 3 = 27
27 = 27
If you want me to use elimination just reply
happy helping :)