grace072702 grace072702

06-02-2018
Mathematics

contestada

Solve the system of equations using the substitution method.
{
4x+5y=7
y=3x+9

Please help?

Respuesta :

WolfLover181957 WolfLover181957

10-02-2018

4x+5(3x+9)=7
4x+15x+45=7
19x+45=7
19x=-38
x=-2

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