Question

Confusssed, help please. using Substitution method

3x=4y=13
x=y-5

Answer 1

first equation has too many equal signs

Answer 2

3x+4y=13 perhaps
3x-4y=13 perhaps

Answer 3

or maybe 3x=4y+13?

Answer 4

yes, another possibility

Answer 5

oops soorry its suppose to be 3x+4y=13

Answer 6

Start with 3x+4y=13 and replace 'x' with y-5


3x+4y=13

3(y-5)+4y=13


From here, solve for y


3(y-5)+4y=13

3y-15+4y=13

7y-15=13

7y=13+15

7y=28

y=28/7

y=4


Then use this value of y to find x.

x=y-5

x=4-5

x=-1


So x = -1 and y = 4