20 point and brainliest 1. solve the system of equations using the substitution method. {4x+5y=7y=3x+9 enter your answers in the boxes. 2.which properties justify the steps taken to solve the system? {4x+3y=252x+−5y=19 drag the answers into the boxes to match each step.

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Step-by-step explanation:

X=-2 and y=3.

The first step we take is to substitute the value for y from the second equation into the first equation:
4x+5(3x+9)=7

This is justified by substitution.  The next step is:
4x+5*3x+5*9=7
4x+15x+45=7

This is justified by the distributive property.  The next step is:
19x+45=7

This is justified by addition of like terms.  The next step is:
19x+45-45=7-45
19x=-38

This is justified by the subtraction property of equality.  The next step is:
19x/19 = -38/19
x=-2

This is justified by the division property of equality.  The next step is:
y=3(-2)+9
y=-6+9
y=3

This is justified by substitution, multiplication and addition, in that order.

Agc and bgd are vertical angles