Question

Using substitutional method, solve the problem.

x= 4y
2x-y=-1

Answer 1

Here, substitute the value of x from equation 1 to equation 2, 
2x - y = -1
2(4y) - y = -1
8y - y = -1
7y = -1
y = -1/7

Now, x = 4(-1/7)
x = -4/7

Hope this helps!