Let's see if 2 y – 3 x really does equal 8 for these bizarro values of x and y. When and, the left-hand side of the equation isĭo these values work in the equation 2 y – 3 x = 8? Do these values work in the equation x + 4 y = 7? Check that the answer works in both original equations. Find the value of the variable we solved for in step 1.Īnother fraction. Where are you from, fraction? Oh, really? Well did you.okay, we can't do this. Let's try to overlook our dislike of fractions, though, and make the most of a bad situation. However, it's the best we can do in this instance. Simplify a bit more to get 14 y = 29, and divide by 14 to track down y: Simplify that thing to find 2 y – 21 + 12 y = 8. After substituting, solve the other equation. Performing substitution gives us 2 y – 3(7 – 4 y) = 8.ģ. In the other equation, perform substitution to get rid of the variable we solved for in step 1. The first equation has x all by itself (with a coefficient of 1), so it's easiest to solve that equation for x.
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