5x-2y=1 4x+5y=47

Question

how to use substitution method with these 

Answer 1

5x - 2y = 1

 

4x + 5y = 47

 

First pick one equation and solve for a variable i always choose x and the first one:

 

5x = 1 + 2y

 

x = (1 + 2y)/5 now we substitute what we found from first equation into second unused equation

 

4[(1+2y)/5] + 5y =47

 

now you solve for y and then plug what you find into the first equation to get x!