18x + 15 - y = 0

5y = 90x + 12

Step By Step and I'll mark you brainliest

Both equations cancel each other out

Step-by-step explanation:

18x + 15 - y = 0

5y = 90x + 12

You want to use the substitution method for this system of equations because the y can easily be isolated in the first equation. Just add y to both sides so that the y variable is isolated. You will have y = 18x + 15. Substitute that equation into the second equation and solve for x. So you will have 5 (18x + 15) = 90x + 12.

Use the Distributive Property to get rid of the parenthesis.

90x + 75 = 90x + 12. Subtract 90x from both sides. There is no value for x as the 90x's cancel each other out. And we all know that 75 does not equal 12