IDNLearn.com offers a collaborative platform for sharing and gaining knowledge. Get accurate and comprehensive answers to your questions from our community of knowledgeable professionals.

Can anyone help me solve this system of equation by elimination?

5x+4y=-30
3x-9y=-18


Sagot :

[tex]\begin{cases}5x+4y=-30\ \ / \cdot (-3) \\3x-9y=-18\ \ / \cdot 5 \end{cases}\\\\ \begin{cases}-15x-12y=90 \\15x-45y=-90 \end{cases}\\+\ --------\\ -57y=0 \\ y=0 \\\\ 5x+4y=-30\\5x+4 \cdot 0=-30 \\5x=-30 \ \ / :5 \\x=-\frac{30}{5}\\x=-6 \\ \\Answer : \\\\ \begin{cases} x=-6 \\ y=0 \end{cases} [/tex]