How do you find X and Y?
4y + 5z = 60
5x + 3y = 60
4x + 3z = 60

1. y=5    x=8

2. x=9     y=5

3. x=12    z=4

Step-by-step explanation:

1.    4(5)+5(8)=60

2.   5(9)+3(5)=60

3.   4(12)+3(4)=60

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

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step-by-step explanation: