2 years ago

Use linear combination. To solve system -2x+7y=10 X-3y=-3

2 answers:

6 0

So
use elimintation
multily second equation by 2
2x-6y=-6
add to first equation

2x-2x+7y-6y=10-6
y=4
subsitute
x-3(4)=-3
x-12=-3
add 12 to both sdies
x=9

x=9
y=4

Tamiku [17]2 years ago

3 0

-2x + 7y = 10 ⇒ -2x + 7y = 10
 x - 3y = -3 ⇒ -2x + 6y = 6 
 y = 4
 -2x + 7(4) = 10
 -2x + 28 = 10
 -28 -28
 -2x = -18
 -2 -2
 x = 9
 (x, y) = (9, 4)

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