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Studentka2010 [4]
3 years ago
13

How do you do this problem?

Mathematics
2 answers:
Snowcat [4.5K]3 years ago
7 0
By the use of substitution:for x,

2x-3y=21 ;

will equal 2x-3 (3-x)=21

2x-9+3x=21

5x=30

x=6.

for y:

since y equals 3-x;

y=3-6=-3
astra-53 [7]3 years ago
5 0
By substitution is how to solve

2x-3y=21
y=3-x

2x-3(3-x)=21 
2x-9+3x=21
5x=30
x= 6

now substitute our x value into y=3-x
so we get 

y=3-6 = -3

so x=6 and y=-3  hope this helps!!!!! Thank you!
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