Answer:
y = 7/2
x = -1/8
Step-by-step explanation:
4x + y = 3-----------eqn 1
4x - y = -5----------eqn 2
Let's pick eqn 1
4x + y = 3
Let's make y the subject of the formula
y = 3 -4x
Since y = 3 - 4x, substitute the value of y into eqn 2
4x - ( 3 - 4x) = -5
Using the - to open the bracket
4x - 3 + 4x = -5
16x - 3 = -5
16x = -5 + 3
16x = -2
Divide through by 16 to get the value of x
16x/ 16 = -2/16
x = -1/8
Since we've gotten the value for x, find y using eqn 1
4x + y = 3
4(-1/8) + y = 3
-4/8 + y = 3
y = 3 + 4/8
LCM is 8
y = 24 + 4 / 8
y = 28/8 ( using 4 to divide)
y = 7/2
x = -1/8
y = 7/2
