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Steps: 1. Take -x + 2y= 21 2. Add x on both sides 2y= x + 21 3. Divide everything by 2 Y= 1/2x + 10.5 4. Substitute the y in 7x + 2y= -19 for 1/2x + 10.5 7x + 2(1/2x + 10.5)= -19 5. Multiply everything in parentheses 7x + x + 21= -19 8x + 21= -19 6. Subtract 21 on both sides 7. 8x=-40 8. Divide each side be 8 9. Your answer is X=-5
it's easier to use -x +2y = 21 so make it all = to x should come out to x= 2y - 21 now substitute what you just found = to x into the other equation 7 (2y - 21) + 2y = - 19 now distribute and simplify 14y - 147 + 2y = -19 16 y = 128 y = 8
now substitute 8 for y in either equation -x + 2( 8) = 21 -x = 5 x = -5
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