# Simultaneous equations variant

#### Greens

You can use the substitution method in this case. Solving for $y$ in equation 1:

$\displaystyle 2.3y = 5.1-3.2x$

$\displaystyle y = \frac{5.1-3.2x}{2.3}$

Now, since we know what $y$ is we can put it into equation 2 and solve for x:

$\displaystyle 4.1x - 3.2 \left( \frac{5.1-3.2x}{2.3} \right) = 7.2$

Once $x$ is solved, but that value into the equation for $y$ in terms of $x$ to get $y$

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#### Denis

Math Team
Can we have decimal points for the variables in Simultaneous equations? [/QUOTE] YESSSSS!! Who are you anyway...a math student?

#### skipjack

Forum Staff
Can we have decimal points for the variables in Simultaneous equations?
In theory, the constants used in the equations needn't be integers. If constants such as 3.2 are given, it's desirable that it's clarified whether they should be treated as exact values. The solutions may be quite sensitive to slight errors (such as rounding or truncation errors) in the values of the constants.