2. Functions, Equations & Solutions
2.17 Solving systems of equations with the elimination method
Interactive practice questions
Consider the following system of equations.
| Equation 1 | $3x+7y=-6$3x+7y=−6 |
| Equation 2 | $2x-y=-17$2x−y=−17 |
Suppose we want to solve this system by using the elimination method and eliminating $y$y.
a
What value can we multiply Equation 2 by so that the coefficients of $y$y in each equation are opposite numbers?
b
What equation do we get when we multiply the second equation by $7$7?
Easy
1min
Consider this system of equations.
| Equation 1 | $\frac{2x}{5}+\frac{3y}{5}=-\frac{7}{5}$2x5+3y5=−75 |
| Equation 2 |
$-\frac{1}{4}\left(-5x+\frac{7y}{9}\right)=2$−14(−5x+7y9)=2 |
Easy
< 1min
Consider the following system of equations.
| $-8x$−8x | $-$− | $y$y | $=$= | $0$0 |
| $-5x$−5x | $+$+ | $3y$3y | $=$= | $6$6 |
We are solving this system using the elimination method.
Easy
2min
When we solve a system of equation using the addition method, what happens when the system has no solutions?
Easy
< 1min
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