When using substitution, you want to solve an equation for one variable that doesn’t make the equation worse to work with.
The general idea is that you want to find a variable that has a coefficient of 1 or -1.
In 2.5x - 7y = 7.5, both variables have “bad” coefficients.
In 6.2x - y = 1, the y has a coefficient of -1. That’s where you want to start.
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Step-by-step explanation:1234
Answer:
Step-by-step explanation:
1) First step is writing the Equation out clearly
be - 9c - a
2) Substituting the given values ; a,b & C
3) -5e + 9(-2/3) - (-1)
4) -5e-5 (answer)
Since we were not given the value for e
