Answer:
x= -1 , y = -9
Step-by-step explanation:
7x−3y=20
y=5x−4
Substitute the second equation into the first equation
7x - 3(5x-4) = 20
distribute
7x -15x +12 = 20
Combine like terms
-8x +12 = 20
subtract 12 from each side
-8x +12-12 = 20-12
-8x = 8
divide each side by -8
-8x/-8 = 8/-8
x = -1
Now we need to find y
y = 5x-4
y = 5(-1) -4
y = -5-4
y = -9
